CN1816172A - Method for realizing switch-over between open call/secrete call in end-to-end voice telecommunication - Google Patents
Method for realizing switch-over between open call/secrete call in end-to-end voice telecommunication Download PDFInfo
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Abstract
The disclosed method is applicable to soft switching system composed of switchboard, cipher key distribution center, controller of base station, public telephone switching network, and encrypted gateway when a call is built for both calling party and called party, and normal communication is carried out. The method also includes following steps: receiving switching request, switchboard determines current communication mode; if the current mode is plain mode, then switchboard at the party, who initiates switching request, applies to cipher key distribution center for cipher key, and switches plain mode to cipher mode; if the current mode is cipher mode, then switchboard at the party, who initiates switching request, sends message for closing cipher mode to another party, and switches current mode to plain mode, and closes cue tone. Plain mode and cipher mode can be switched by initiating switching request by calling party without interrupting normal communication in the invention.
Description
Technical field
The present invention relates to the coded communication technology, refer to realize in a kind of end-to-end voice telecommunication the mutual method of switching between unencryped word/encrypted word especially.
Background technology
Voice encryption is a kind of technology of voice communication being carried out voice encryption and deciphering end to end, can realize that voice transmit in the mode of encrypting in channel and the core net network aloft, but at present, this coded communication mode requires the user just to know that before making a call the other side also is the terminal of support voice encrypting and decrypting, just may fail otherwise call out, this has brought very big inconvenience for the use of coded communication.
Therefore be necessary to realize a kind of can be in communication process, promptly not under the situation of interrupt call, initiate the function of switching mutually between ordinary voice communications and enciphoring voice telecommunication.The user can at first set up conversation with the mode of ordinary call like this, it is unencryped word, then in the terminal of understanding both call sides support voice encrypting and decrypting function all, it is the encrypted word function, and follow-up conversation need be used under the situation of encrypted word function, the user can just can switch to the encrypted word communications status without interrupt call.
In order to realize voice encryption end to end, the applicant has proposed a kind of enciphoring voice telecommunication networking structure based on soft switchcall server in another patent application, this networking structure schematic diagram as shown in Figure 1, dotted line represents to transmit signaling-information among Fig. 1, solid line is represented voice signal.Fig. 1 mainly comprises: switch, encrypted word gateway exchange, base station controller (BSC), KDC, Public Switched Telephone Network, encryption gateway and coded communication terminal.Wherein, coded communication terminal can be portable terminal (MS) or the encryption gateway that is connected with the encrypted word gateway exchange; And switch, encrypted word gateway exchange, KDC and encryption gateway are formed the network control center.
Wherein, switch/encrypted word gateway exchange is made up of soft switching server (MSCe) and media gateway (MGW).When external portable terminal, MSCe and MGW can also be substituted by traditional circuit type switch, switch/encrypted word gateway exchange is used to receive, discern from the encrypted word of coded communication calling terminal and call out and issue the assignment request, finish and called MS Ce and MGW between calling control; MSCe applies for key according to call encryption to KDC in addition, and the key that will apply for is handed down to caller, called respectively.
KDC accepts the coded communication user and authenticates to its KDC that carries out by MSCe; According to the application of MSCe, to MSCe distribution caller and called key.
BSC receives the notification message bypass TC from MSCe, and can be according to the CODEC parameter notice mobile terminal to update current C ODEC that carries in the message.
The coded communication terminal is initiated encrypted word to MSCe and is called out; Wherein portable terminal receives the key that MSCe issues, and call voice is carried out enciphering/deciphering, and encrypted word gateway exchange side, is to receive key that the encrypted word gateway exchange issues and call voice is carried out enciphering/deciphering by encrypting gateway; Portable terminal can receive from the renewal CODEC notice of BSC and carry out.
Simultaneously, based on the networking structure of Fig. 1, the applicant also proposes a kind of method of end-to-end speech coded communication, and this method is to be the method for the end-to-end enciphoring voice telecommunication at center with the network control, receive and identify encrypted word by the network control center and call out, and finish encrypted word and call out control; The network control center participates in encrypted word both sides' key to KDC (KDC) application, and after the speech coding form (CODEC) that guarantees the encrypted word both sides through consultation is consistent, give the encrypted word both sides by the network control center with delivering key, while network control center's informing base station controller (BSC) bypass voice transcoder (TC), last both sides carry out enciphoring voice telecommunication.
But this encrypted word method for communicating requires calling party in the function of initiating just to know before encrypted word is called out the equal support voice encrypting and decrypting of the other side, otherwise even if access success can not be realized normal speech scrambling, this has brought very big inconvenience for the use of coded communication.
Summary of the invention
In view of this, main purpose of the present invention is to provide the mutual method of switching between unencryped word/encrypted word that realizes in a kind of end-to-end voice telecommunication, this method can be implemented in the mutual switching between unencryped word and encrypted word in the communication process, makes encrypted word communication more reliably, finish easily.
For achieving the above object, technical scheme of the present invention specifically is achieved in that
A kind of method that in end-to-end voice telecommunication, realizes mutual switching between unencryped word/encrypted word, this method is applicable to the soft switchcall server that comprises switch, KDC, base station controller, public switched telephone network (PSTN) and encryption gateway; The calling and called both sides set up calling and carry out in the normal talking process, and a side initiates the handoff request of unencryped word/encrypted word, and this method is further comprising the steps of:
After switch is received handoff request, determine the current talking mode,, then initiate a side place switch of handoff request and apply for key, and after obtaining encryption key, current talking is switched to encrypted word to KDC if the current talking mode is a unencryped word;
If the current talking mode is an encrypted word, then initiate a side place switch of handoff request and close encrypted word message to the encrypted word gateway exchange transmission of the opposing party place switch/access, current talking is switched to unencryped word.
Carry the handoff features sign indicating number in described unencryped word/encrypted word handoff request.
Also carrying the speech coding form CODEC that the side that initiates handoff request supported in the described handoff request tabulates.
The described method that unencryped word is switched to encrypted word is:
A1. initiate a side place switch of handoff request and apply for key to KDC, KDC produces encryption key, and the encryption key that produces returned to a side place switch of initiating handoff request, this switch sends to the opposing party's encryption key the encrypted word gateway exchange of the opposing party place switch/access simultaneously;
The encrypted word gateway exchange of b1. initiating a side place switch of handoff request and the opposing party place switch/access sends to encryption key a side and the opposing party of initiating handoff request respectively and encrypts gateway, initiates a side and/or the opposing party place switch informing base station controller bypass speech coding format converter TC of handoff request simultaneously;
C1. both sides utilize the encryption key that receives to carry out encrypted word communication.
The described method that the opposing party's encryption key is sent to the encrypted word gateway exchange of the opposing party place switch/access of step a1 is:
The one side place switch of initiating handoff request sends and carries the encrypted word gateway exchange of the transmission informational message of the opposing party's encryption key to the opposing party place switch/access;
After the encrypted word gateway exchange of the opposing party place switch/access receives described transmission informational message, to a side place switch return information acknowledge message of initiating handoff request.
Also carrying the CODEC that the side that initiates handoff request supported in the described transmission informational message tabulates.
Described the opposing party also comprises the CODEC information that consults for the simulation fixed telephone terminal in the then described validation of information message of returning.
Described both sides are portable terminal, initiate a side place switch of handoff request and the encrypted word gateway exchange of the opposing party place switch/access described in the step b1 and specifically comprise to a side who initiates handoff request and the method that the opposing party sends encryption key respectively:
Both sides' place switch separately carry both sides' encryption key separately in issuing key message, and the key message that issues is separately sent to both sides respectively;
Receive described issue key message after, twocouese place switch separately returns acknowledge message.
Described twocouese also comprises after the place switch returns acknowledge message separately:
The opposing party place switch sends the transmission informational message of carrying the CODEC information that consults to a side place switch of initiating handoff request; After receiving this transmission informational message, initiate a side place switch return information acknowledge message of handoff request.
Described the opposing party is for simulating fixed telephone terminal, and the encrypted word gateway exchange that a side place switch of the handoff request of initiation described in the step b1 and the opposing party insert specifically comprises to the method for a side who initiates handoff request and encryption gateway transmission encryption key respectively:
The encrypted word gateway exchange that the opposing party inserts carries the encryption key of self in issuing key message, and this is issued key message sends to the encryption gateway;
Receive described issue key message after, described encryption gateway returns acknowledge message to described encrypted word gateway exchange.
The method of the speech coding of bypass described in step b1 format converter TC:
One side of described initiation handoff request and/or the opposing party are portable terminal, one side of described initiation handoff request and/or the opposing party place switch send a notification message to base station controller, after receiving this notification message, base station controller bypass speech coding format converter TC.
Carry the CODEC information that consults in the described notification message.
After notified message of base station controller described in the step b1 and the bypass TC, before switching to encrypted word, this method also comprises: a root of described initiation handoff request is this CODEC that consults according to the CODEC that the consults renewal of carrying in the described notification message self speech coding type, after upgrading successfully, a direction base station controller of initiating handoff request returns and upgrades successful response message.
The described method that encrypted word is switched to unencryped word is:
The one side place switch of a2. initiating handoff request to the opposing party place switch send carry the unencryped word communication identifier close the voice encryption feature message;
B2. the message of closing encrypted word that both sides place switch will receive respectively sends to a side and the opposing party who initiates handoff request or encrypts gateway;
C2. both sides switch to unencryped word communication according to the encrypted word message of closing that receives.
Described switch receives after the handoff request, switched to before the encrypted word by current talking, and this method also comprises: a side place switch playing alert tones of initiating handoff request;
Described when switching to encrypted word by current talking, initiate a side place switch of handoff request and close prompt tone.
One side of described initiation handoff request is a portable terminal.
As seen from the above technical solution, realize the mutual method of switching between unencryped word/encrypted word in this end-to-end voice telecommunication of the present invention, if calling both sides has the needs of secret telephony, only need calling terminal to initiate handoff request, just can be implemented in the communication process and change encrypted word communication into, guarantee call confidentiality from unencryped word communication; If calling both sides does not need to keep encrypted word communication, also only need calling terminal to initiate handoff request, can get back to the unencryped word communication mode again.The inventive method is succinct, and can guarantee under the situation of not interrupting normal talking, realizes the mutual switching between unencryped word and encrypted word.
Description of drawings
Fig. 1 is based on the enciphoring voice telecommunication networking schematic diagram of soft switchcall server;
Fig. 2 realizes the mutual flow chart that switches between unencryped word/encrypted word during the present invention communicates by letter between portable terminal;
Fig. 3 realizes between unencryped word/encrypted word the flow chart of switching mutually during to be the present invention communicate by letter between portable terminal and simulation fixed telephone terminal.
Embodiment
Core concept of the present invention is: utilize existing end-to-end call flow, calling both sides is set up and is called out and normal talking.When calling both sides has the encrypted word demand, the switch of its place network control center of a direction in the conversation is initiated handoff request, after receiving handoff request, the network control center judges that current talking is unencryped word or encrypted word, if unencryped word, then the network control center is after KDC application both sides key and the delivering key that will apply for are given both sides in the conversation, and both call sides enters encrypted word after starting the voice encryption function; If current talking is encrypted word, then the network control center will cancel encrypted word notice both call sides, and after receiving the cancellation encrypted word and notifying, both sides enter unencryped word after closing the voice encryption function.
For making purpose of the present invention, technical scheme and advantage clearer, below with reference to the accompanying drawing preferred embodiment that develops simultaneously, the present invention is described in more detail.
To be example, the inventive method is described in detail below based on soft switchcall server.
Fig. 2 realizes the mutual flow chart that switches between unencryped word/encrypted word during the present invention communicates by letter between portable terminal, suppose caller MS and called MS all at KDC by the encrypted word qualification authentication, be KDC authentication, and caller MS respectively transmit segmentation in the voice transfer path of called MS and adopts different CODEC to transmit; On the soft switching server of the network control center, set in advance the handoff features sign indicating number, be made as such as this handoff features sign indicating number
*88.
Suppose and utilize existing end-to-end call flow to set up calling between caller MS and the called MS, and communicate by letter for unencryped word between caller MS and the called MS, realize during the present invention communicates by letter that the method for switching mutually between unencryped word/encrypted word may further comprise the steps between portable terminal:
Step 200: caller MS initiates handoff request to its place MSCe, receive handoff request after, MSCe determines that the current talking mode is to enter step 201 behind the unencryped word.
In the present embodiment, caller MS can be by keying in the handoff features sign indicating number
*88 initiate handoff request.When caller MS key entry handoff features sign indicating number, and after pressing existing " sending (SEND) " key, caller MS is with the handoff features sign indicating number
*88 are carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.Caller MS also can initiate handoff request by next hot key that pre-defines, after caller MS presses this hot key, can trigger caller MS and will be preset in handoff features sign indicating number 88 among the caller MS and be carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.Here, also can trigger switching, not necessarily have condition code by the signaling of appointment.
In addition, in the present embodiment, be to adopt different CODEC to transmit because hypothesis caller MS respectively transmits segmentation in the voice transfer path of called MS, so in FLASH WITH INFO signaling, also need carry the CODEC tabulation that caller MS is supported.If it is to adopt identical CODEC to transmit that caller MS respectively transmits segmentation in the voice transfer path of called MS, so, in FLASH WITH INFO signaling, then do not need to carry the CODEC tabulation that caller MS is supported.
After MSCe receives FLASH WITH INFO signaling, with handoff features sign indicating number that carries in this signaling and the handoff features sign indicating number that sets in advance relatively, if conform to, and the current talking mode is a unencryped word, then MSCe can give caller MS and called MS by playing alert tones, such as: " the encrypted word request receives, system's present, please after a while ".
Step 201: caller MS place MSCe is to the voice encryption key of KDC application caller MS and called MS, and KDC produces caller MS encryption key and called MS encryption key, then the encryption key that produces is returned caller MS place MSCe.
Comprise information such as caller MS number, called MS number in the message of application voice encryption key.KDC to caller, calledly encrypt qualification authentication, in the present embodiment, supposed caller MS and called MS all at KDC by the encrypted word authentication, so after authentication was passed through, KDC returned caller MS encryption key, called MS encryption key to caller place MSCe.
Here, reciprocal process between MSCe and the KDC depends on cipher mode, adopt different cipher modes, such as: common cipher key change mode has the symmetric key mode at present, asymmetric key mode, D-H cipher key change mode etc., the reciprocal process between MSCe and the KDC is difference to some extent, and this belongs to known technology.
Step 202: caller MS place MSCe is to the transmission informational message (Info) of MSCe transmission in called MS place based on the soft switch interoffice signaling (SIP-T) of SIP, after receiving this Info message, called MS place MSCe receives validation of information message to the 200OK that caller MS place MSCe returns based on SIP-T.
In the present embodiment, comprise the CODEC tabulation that called MS encryption key and caller MS are supported in this Info message.
Step 203: caller MS place MSCe and called MS place MSCe issue key message to caller MS and called MS transmission respectively, as FLASH WITH INFO, after receiving this FLASHWITH INFO, caller MS and called MS are returned acknowledge message FLASH WITH INFO ACK to self place MSCe respectively.
In this step, at caller MS and called MS, this FLASH WITH INFO content is different: (1) caller MS is the handoff request initiator, so caller MS place MSCe carries caller MS encryption key in the FLASH WITH INFO that caller MS sends; (2) called MS place MSCe carries the CODEC tabulation that called MS encryption key and caller MS are supported in the FLASH WITH INFO that called MS sends.
Equally, also difference to some extent of the FLASH WITH INFO ACK message that caller MS and called MS are returned: the FLASH WITH INFO ACK message that (1) caller MS returns illustrates that caller MS has successfully started the voice encryption function; (2) the FLASH WITH INFO ACK message returned of called MS except the explanation called MS has successfully started the voice encryption function, in this message, is also carried the CODEC information that caller MS and called MS support after called MS is consulted.
Step 204: after called MS place MSCe receives the FLASH WITH INFOACK message that called MS returns, send the Info message based on SIP-T of carrying the CODEC information that consults to caller MS place MSCe, return acknowledge message after the MSCe at caller MS place receives this Info message.
Afterwards, caller MS place MSCe closes prompt tone.
Step 205: caller MS place MSCe, called MS place MSCe send a notification message to its BSC respectively, notice BSC bypass TC.
In the present embodiment, because respectively transmitting segmentation in the voice transfer path of called MS, caller MS adopt different CODEC to transmit, so notification message is realized by Bear Updata Req message, and carry the CODEC information that consults in Bear Updata Req message.
The function of TC is exactly that voice flow to process carries out the encoding and decoding speech conversion, and bypass TC promptly is that the processing procedure of shielding speech coding format conversion gets final product.Specifically be exactly after BSC receives bypass TC order, will close TC, promptly no longer voice flow carried out the conversion process of encoding and decoding at this voice flow.
Step 206: after caller MS/ called MS is received Bear Updata Req message, according to the CODEC information updating of carrying in this message self CODEC, the CODEC of self current employing is consistent with the CODEC that consults, send Bear Updata ACK message to place BSC respectively then, expression CODEC upgrades successfully.
So far, switch to encrypted word from unencryped word between caller MS and the called MS.If the A2 interface between BSC and the MSCe is to adopt the IP mode to transmit information, BSC does not do any processing to voice so, promptly BSC with voice through A2 interface transparent transmission; If the A2 interface is to adopt circuit type repeat circuit (TDM) mode to transmit information, BSC goes up transmission according to the ISLP form with the PCM that voice are fitted to 64K so, promptly exempts from the secondary coding-decoding function.
After the calling and called both sides are through an end time encrypted word, if the demand of switching back unencryped word is arranged, then have following step, hypothesis still proposes handoff request by caller MS here:
Step 207: caller MS initiates handoff request to its place MSCe, receives handoff request and determines that the current talking mode is to enter step 208 behind the encrypted word.
In the present embodiment, caller MS can be by keying in the handoff features sign indicating number
*88 initiate switch call.When caller MS key entry handoff features sign indicating number, and after pressing existing " sending (SEND) " key, caller MS is with the handoff features sign indicating number
*88 are carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.Caller MS also can initiate handoff request by next hot key that pre-defines, and after caller MS presses this hot key, can trigger caller MS and will be preset in handoff features sign indicating number among the caller MS
*88 are carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.
After MSCe received FLASH WITH INFO signaling, with the handoff features sign indicating number that carries in this signaling and the handoff features sign indicating number that sets in advance relatively, if conform to, and the current talking mode was encrypted word, then enters step 208.
Step 208: caller MS place MSCe sends Info message based on SIP-T to called MS place MSCe, receive this Info message after, called MS place MSCe returns to caller MS place MSCe and receives acknowledge message.
In this step, because caller MS place MSCe determines that the current talking mode is an encrypted word, so carry the information of expression unencryped word communication in this Info message, as " no Key " sign, notice called MS place MSCe prepares to switch to unencryped word.
It should be noted that: owing to be to switch to unencryped word from encrypted word, so there is not negotiation problem to CODEC.
Step 209: caller MS place MSCe and called MS place MSCe send FLSH WITH INFO to caller MS and called MS respectively, require to close encryption function message; After receiving this FLSH WITH INFO, caller MS and called MS are not carried out encrypt/decrypt to voice, and to the response of place MSCe separately FLSH WITH INFO, show and close the voice encryption function.
In FLSH WITH INFO, carry " no Key " sign of expression unencryped word communication.
So far, switch to unencryped word from encrypted word between caller MS and the called MS.
Attention: because in encrypted word, calling and called have been to have adopted consistent CODEC, so when encrypted word switches to unencryped word, need not reopen TC.
The above is to realize the mutual step of switching between unencryped word/encrypted word during the present invention communicates by letter between portable terminal, in the present embodiment, the calling and called both sides have set up calling by existing end-to-end call flow, and are in unencryped word at the beginning between caller MS and the called MS and communicate by letter.If beginning just is in the encrypted word state between the calling and called, can use the inventive method according to user's request equally, switch to unencryped word from encrypted word.
In addition, in the present embodiment, all be that hypothesis is initiated handoff request by the calling party, also can initiate handoff request by the callee, so, just apply for key and be handed down to the calling party to KDC by called MS place MSCe; Consult CODEC if desired, then callee place MSCe is when giving the calling party with delivering key, CODEC tabulation with called support simultaneously sends to caller, by the CODEC tabulation of calling party according to called support, contrasts the CODEC that self supports, this CODEC tabulation is held consultation, after consulting, the calling party returns to the callee with the CODEC information that consults, and processing method as mentioned above, just executor's difference no longer repeats.
If the calling and called both sides initiate handoff request, network side can carry out ruling, and the ruling principle is as follows:
A side who initiates earlier handoff request is master control side, if the opposing party at this moment, promptly prosecution is also initiated handoff request, and then this request will be left in the basket;
If both sides initiate handoff request simultaneously, all send Info message and all receive the Info message that the other side place MSCe sends again at interoffice both sides MSCe, then system default one side is master control side, is master control side as the former calling subscriber of regulation acquiescence, promptly receives the handoff request that the calling party initiates.
In the present embodiment, suppose that also caller MS respectively transmits segmentation in the voice transfer path of called MS and adopts different CODEC to transmit, if adopt identical CODEC to transmit in the voice transfer path between caller MS and the called MS, then have these steps different in the above-mentioned steps:
In the step 200, initiate in the FLASH WITH INFO signaling of handoff request in caller, can carry the CODEC tabulation that caller MS is supported, also can not carry this CODEC tabulation, this depends on the design of dispatching from the factory of portable terminal itself.
In the step 202, caller MS place MSCe need not to carry the CODEC tabulation that caller MS supports in the Info message that called MS place MSCe sends, there is not the step of consulting the CODEC form in called MS place MSCe yet, and called MS place MSCe receives only called encryption key.
In the step 203, called MS place MSCe carries the called MS encryption key and gets final product in the FLASH WITH INFO that called MS sends; The FLASH WITH INFOACK message that called MS is returned illustrates that called MS has successfully started the voice encryption function.
Step 204 item does not exist.
In the step 205, notification message changes into by Transcoder Control Req message and realizing, does not have the problem of carrying the CODEC information that consults in the message equally.
Step 206 does not exist.
In conversation, to realize switching to example between unencryped word/encrypted word between portable terminal and the simulation fixed telephone terminal, the inventive method is described below.
Fig. 3 realizes between unencryped word/encrypted word the flow chart of switching mutually during to be the present invention communicate by letter between portable terminal and simulation fixed telephone terminal, suppose that caller MS passes through the encrypted word qualification authentication at KDC, be KDC authentication, and caller MS respectively transmit segmentation in the voice transfer path of called POTS and adopts different CODEC to transmit; Because the POTS terminal is general not to the adding of voice, decipher function, therefore in the voice transfer path, must connect an encrypted word gateway exchange, the encrypted word gateway exchange is hung one down and is encrypted gateway, replace the POTS terminal that voice are added, decipher by encrypting gateway, the encrypted word communication is carried out between portable terminal and encryption gateway; On the soft switching server of the network control center, set in advance the handoff features sign indicating number, be made as such as this handoff features sign indicating number
*88.
Suppose and utilize existing end-to-end call flow to set up calling between caller MS and the called POTS, and communicate by letter for unencryped word between caller MS and the called POTS, realize during the present invention communicate by letter between unencryped word/encrypted word that the method for switching may further comprise the steps mutually between portable terminal and simulation fixed telephone terminal:
Step 300: caller MS initiates handoff request to its place MSCe, receives handoff request, and MSCe determines that the current talking mode is to enter step 301 behind the unencryped word.
In the present embodiment, caller MS can be by keying in the handoff features sign indicating number
*88 initiate switch call.When caller MS key entry handoff features sign indicating number, and after pressing existing " sending (SEND) " key, caller MS is with the handoff features sign indicating number
*88 are carried at FLASH WITH INFO signaling sends to caller MS place MSCe.Caller MS also can initiate handoff request by next hot key that pre-defines, and after caller MS presses this hot key, can trigger caller MS and will be preset in handoff features sign indicating number among the caller MS
*88 are carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.Here, also can trigger switching, not necessarily have condition code by the signaling of appointment.
In addition, in the present embodiment, be to adopt different CODEC to transmit because hypothesis caller MS respectively transmits segmentation in the voice transfer path of called POTS, so in FLASH WITH INFO signaling, also need carry the CODEC tabulation that caller MS is supported.Certainly, be to adopt identical CODEC to transmit if caller MS respectively transmits segmentation in the voice transfer path of called MS, so, in FLASH WITH INFO signaling, then do not need to carry the CODEC tabulation that caller MS is supported.
After MSCe receives FLASH WITH INFO signaling, with handoff features sign indicating number that carries in this signaling and the handoff features sign indicating number that sets in advance relatively, if conform to, and the current talking mode is a unencryped word, then MSCe can give caller MS and called POTS by playing alert tones, such as: " the encrypted word request receives, system's present, please after a while ".
Step 301: caller MS place MSCe is to the voice encryption key of KDC application caller MS and called POTS place encryption gateway, and KDC produces caller MS encryption key and called MS encryption key, then the encryption key that produces is returned caller MS place MSCe.
Comprise information such as caller MS number, called POTS number in the message of application voice encryption key.KDC encrypts qualification authentication to caller, in the present embodiment, has supposed that caller MS passes through the encrypted word authentication at KDC, so after authentication was passed through, KDC returned caller MS encryption key, called POTS place encryption gateway encryption key to caller place MSCe.
Here, reciprocal process between MSCe and the KDC depends on cipher mode, adopt different cipher modes, such as: common cipher key change mode has the symmetric key mode at present, asymmetric key mode, D-H cipher key change mode etc., the reciprocal process between MSCe and the KDC is difference to some extent, and this belongs to known technology.
Step 302: the encrypted word gateway exchange that caller MS place MSCe inserts to called POTS sends the Info message based on SIP-T, receive this Info message after, the encrypted word gateway exchange returns to caller MS place MSCe and receives validation of information message.
In the present embodiment, comprise the CODEC tabulation that the encryption gateway encryption key that is connected with the encrypted word gateway exchange and caller MS are supported in this Info message.
In this step, the encrypted word gateway exchange is according to the CODEC tabulation of carrying in this Info message, encrypt the CODEC that gateway is supported, this CODEC tabulation is held consultation, keep in the former CODEC tabulation and encrypt the CODEC information that gateway is supported, and the unsupported CODEC information of gateway is encrypted in deletion, and with the caller MS that consults with encrypt CODEC information that gateway all supports and be carried at and return to caller MS place MSCe in the acknowledge message.
Step 303: caller MS place MSCe sends to caller MS and issues key message, as the FLASHWITH INFO, receive this FLASH WITH INFO after, caller MS returns acknowledge message FLASH WITH INFO ACK to self place MSCe; The encrypted word gateway exchange is encrypted gateway and is returned acknowledge message Open encipher ACK. to the encrypted word gateway exchange after encrypting gateway transmission Open encipher message, receiving this Open encipher message
In this step, caller MS place MSCe carries caller MS encryption key in the FLASH WITH INFO that caller MS sends; The encrypted word gateway exchange carries the encryption key of encrypting gateway in the Open encipher message of encrypting the gateway transmission.
The Open encipher ACK message that caller MS and encryption gateway return illustrates caller MS respectively and encrypts the voice encryption function that gateway has successfully started this calling.
Afterwards, caller MS place MSCe closes prompt tone.
Step 304: caller MS place MSCe sends a notification message to its BSC, notice BSC bypass TC.
In the present embodiment, because respectively transmitting segmentation in the voice transfer path of called POTS, caller MS adopt different CODEC to transmit, so notification message is realized by Bear Updata Req message, and carry the CODEC information that consults in Bear Updata Req message.
The function of TC is exactly that voice flow to process carries out the encoding and decoding speech conversion, and bypass TC promptly is that the processing procedure of shielding speech coding format conversion gets final product.Specifically be exactly after BSC receives bypass TC order, will close TC, promptly no longer voice flow carried out the conversion process of encoding and decoding at this voice flow.
Step 305: after caller MS receives Bear Updata Req message, according to the CODEC information updating that consults self the encoding and decoding speech type of carrying in this message, the encoding and decoding speech type of self current employing is consistent with the CODEC that consults, send Bear UpdataACK message to place BSC then, expression CODEC upgrades successfully.
So far, switch to encrypted word from unencryped word between caller MS and the called POTS.If the A2 interface between BSC and the MSCe is to adopt the IP mode to transmit information, BSC does not do any processing to voice so, promptly BSC with voice through A2 interface transparent transmission; If the A2 interface is to adopt the TDM mode to transmit information, BSC goes up transmission according to the ISLP form with the PCM that voice are fitted to 64K so, promptly exempts from the secondary coding-decoding function.
After the calling and called both sides are through an end time encrypted word, if the demand of switching back unencryped word is arranged, then have following step, hypothesis still proposes handoff request by caller MS here:
Step 306: caller MS initiates handoff request to its place MSCe, receives handoff request, and MSCe determines that the current talking mode is to enter step 307 behind the encrypted word.
In the present embodiment, caller MS can be by keying in the handoff features sign indicating number
*88 initiate switch call.When caller MS key entry handoff features sign indicating number, and after pressing existing " sending (SEND) " key, caller MS is with the handoff features sign indicating number
*88 are carried at FLASH WITH INFO signaling sends to caller MS place MSCe.Caller MS also can initiate handoff request by next hot key that pre-defines, and after caller MS presses this hot key, can trigger caller MS and will be preset in handoff features sign indicating number among the caller MS
*88 are carried in the FLASH WITH INFO signaling and send to caller MS place MSCe.
After MSCe received FLASH WITH INFO signaling, with the handoff features sign indicating number that carries in this signaling and the handoff features sign indicating number that sets in advance relatively, if conform to, and the current talking mode was encrypted word, then enters step 307.
Step 307: caller MS place MSCe sends Info message based on SIP-T to the encrypted word gateway exchange, receive this Info message after, the encrypted word gateway exchange returns to caller MS place MSCe and receives acknowledge message.
In this step, because caller MS place MSCe judges that the current talking mode is an encrypted word, so carry expression " no Key " sign with unencryped word communication in this Info message, notice encrypted word gateway exchange is prepared to switch to unencryped word.
It should be noted that: owing to be to switch to unencryped word from encrypted word, so there is not negotiation problem to CODEC.
Step 308: caller MS place MSCe sends FLASH WITH INFO to caller MS, encryption function message is closed in requirement, after receiving this FLASH WITH INFO, caller MS closes the voice encryption function, and, show that caller MS no longer carries out encrypt/decrypt to voice to its place MSCe response FLSH WITH INFO ACK acknowledge message; The encrypted word gateway exchange sends Open encipher message to encrypting gateway, after receiving this Open encipher message, encrypt gateway and no longer the voice of this calling are carried out encrypt/decrypt, and, show and encrypt the voice encryption function that gateway has been closed this calling to encrypted word gateway exchange response Open encipher ACK acknowledge message.
In FLSH WITH INFO and Open encipher message, all carry expression " no Key " sign with the unencryped word communication.
So far, switch to unencryped word from encrypted word between caller MS and the called MS.
In the present embodiment, the calling party is a portable terminal, the callee is the simulation fixed telephone terminal, can certainly be that the calling party is the simulation fixed telephone terminal, and the callee be a portable terminal, still, there is any to need explanation, can only be that one of portable terminal can that is to say that the present invention is applicable to that a wherein side of both call sides or both sides are situations of portable terminal to initiate handoff request.
Equally, in the present embodiment, suppose that the calling and called both sides have set up calling by existing end-to-end call flow at the beginning, and be between caller MS and the called POTS during unencryped word communicates by letter, if beginning just is in the encrypted word state between the calling and called, can use the inventive method according to user's request equally, switch to unencryped word from encrypted word.
In addition, in the present embodiment, suppose that also caller MS respectively transmits segmentation in the voice transfer path of called MS and adopts different CODEC to transmit, if adopt identical CODEC to transmit in the voice transfer path between caller MS and the called MS, then the relevant content that the CODEC form is held consultation will be omitted equally in the above-mentioned steps, specifically no longer repeat.
From above-mentioned two embodiment, as can be seen, the present invention can realize that end-to-end voice telecommunication switches mutually between unencryped word and encrypted word under the unbroken situation of conversation, guaranteed the reliability of both call sides encrypted word, for the talking mode of both call sides selects to bring great convenience.
Among above-mentioned two embodiment, be by carrying out the encryption key transmission at the MSCe of both call sides interoffice, also can adopt interoffice signaling such as BICC to transmit based on the signaling of SIP-T.In addition, be to adopt FLASH WITH INFO signaling to initiate handoff request among the above embodiment, also can use other out-of-band signalling and initiate handoff request.
Need explanation a bit, more than two embodiment be that example is introduced with the soft switchcall server, the switching system of the switch that is integrated for soft switching server and media gateway, the inventive method is suitable equally.Only need the processing procedure of soft switching server is realized getting final product by the switch that is positioned at network side.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention.
Claims (16)
1. realize the mutual method of switching between unencryped word/encrypted word for one kind in end-to-end voice telecommunication, this method is applicable to the soft switchcall server that comprises switch, KDC, base station controller, public switched telephone network (PSTN) and encryption gateway; The calling and called both sides set up calling and carry out in the normal talking process, and a side initiates the handoff request of unencryped word/encrypted word, it is characterized in that this method is further comprising the steps of:
After switch is received handoff request, determine the current talking mode,, then initiate a side place switch of handoff request and apply for key, and after obtaining encryption key, current talking is switched to encrypted word to KDC if the current talking mode is a unencryped word;
If the current talking mode is an encrypted word, then initiate a side place switch of handoff request and close encrypted word message to the encrypted word gateway exchange transmission of the opposing party place switch/access, current talking is switched to unencryped word.
2. method according to claim 1 is characterized in that, carries the handoff features sign indicating number in described unencryped word/encrypted word handoff request.
3. method according to claim 2 is characterized in that, also carries the speech coding form CODEC that the side that initiates handoff request supported in the described handoff request and tabulates.
4. method according to claim 1 is characterized in that, the described method that unencryped word is switched to encrypted word is:
A1. initiate a side place switch of handoff request and apply for key to KDC, KDC produces encryption key, and the encryption key that produces returned to a side place switch of initiating handoff request, this switch sends to the opposing party's encryption key the encrypted word gateway exchange of the opposing party place switch/access simultaneously;
The encrypted word gateway exchange of b1. initiating a side place switch of handoff request and the opposing party place switch/access sends to encryption key a side and the opposing party of initiating handoff request respectively and encrypts gateway, initiates a side and/or the opposing party place switch informing base station controller bypass speech coding format converter TC of handoff request simultaneously;
C1. both sides utilize the encryption key that receives to carry out encrypted word communication.
5. method according to claim 4 is characterized in that, the described method that the opposing party's encryption key is sent to the encrypted word gateway exchange of the opposing party place switch/access of step a1 is:
The one side place switch of initiating handoff request sends and carries the encrypted word gateway exchange of the transmission informational message of the opposing party's encryption key to the opposing party place switch/access;
After the encrypted word gateway exchange of the opposing party place switch/access receives described transmission informational message, to a side place switch return information acknowledge message of initiating handoff request.
6. method according to claim 5 is characterized in that, also carries the CODEC that the side that initiates handoff request supported in the described transmission informational message and tabulates.
7. method according to claim 6 is characterized in that, described the opposing party also comprises the CODEC information that consults for the simulation fixed telephone terminal in the then described validation of information message of returning.
8. method according to claim 4, it is characterized in that, described both sides are portable terminal, initiate a side place switch of handoff request and the encrypted word gateway exchange of the opposing party place switch/access described in the step b1 and specifically comprise to a side who initiates handoff request and the method that the opposing party sends encryption key respectively:
Both sides' place switch separately carry both sides' encryption key separately in issuing key message, and the key message that issues is separately sent to both sides respectively;
Receive described issue key message after, twocouese place switch separately returns acknowledge message.
9. method according to claim 8 is characterized in that, described twocouese also comprises after the place switch returns acknowledge message separately:
The opposing party place switch sends the transmission informational message of carrying the CODEC information that consults to a side place switch of initiating handoff request; After receiving this transmission informational message, initiate a side place switch return information acknowledge message of handoff request.
10. method according to claim 4, it is characterized in that, described the opposing party is for simulating fixed telephone terminal, and the encrypted word gateway exchange that a side place switch of the handoff request of initiation described in the step b1 and the opposing party insert specifically comprises to the method for a side who initiates handoff request and encryption gateway transmission encryption key respectively:
The encrypted word gateway exchange that the opposing party inserts carries the encryption key of self in issuing key message, and this is issued key message sends to the encryption gateway;
Receive described issue key message after, described encryption gateway returns acknowledge message to described encrypted word gateway exchange.
11. method according to claim 4 is characterized in that, the method for the speech coding of bypass described in step b1 format converter TC:
One side of described initiation handoff request and/or the opposing party are portable terminal, one side of described initiation handoff request and/or the opposing party place switch send a notification message to base station controller, after receiving this notification message, base station controller bypass speech coding format converter TC.
12. method according to claim 11 is characterized in that, carries the CODEC information that consults in the described notification message.
13. method according to claim 12, it is characterized in that, after notified message of base station controller described in the step b1 and the bypass TC, before switching to encrypted word, this method also comprises: a root of described initiation handoff request is this CODEC that consults according to the CODEC that the consults renewal of carrying in the described notification message self speech coding type, after upgrading successfully, a direction base station controller of initiating handoff request returns and upgrades successful response message.
14. method according to claim 1 is characterized in that, the described method that encrypted word is switched to unencryped word is:
The one side place switch of a2. initiating handoff request to the opposing party place switch send carry the unencryped word communication identifier close the voice encryption feature message;
B2. the message of closing encrypted word that both sides place switch will receive respectively sends to a side and the opposing party who initiates handoff request or encrypts gateway;
C2. both sides switch to unencryped word communication according to the encrypted word message of closing that receives.
15. method according to claim 1 is characterized in that, described switch receives after the handoff request, switched to before the encrypted word by current talking, and this method also comprises: a side place switch playing alert tones of initiating handoff request;
Described when switching to encrypted word by current talking, initiate a side place switch of handoff request and close prompt tone.
16. method according to claim 1 is characterized in that: a side of described initiation handoff request is a portable terminal.
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| CNB2005100075140A CN100415005C (en) | 2005-02-05 | 2005-02-05 | Method for realizing switch-over between open call/secrete call in end-to-end voice telecommunication |
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| CNB2005100075140A CN100415005C (en) | 2005-02-05 | 2005-02-05 | Method for realizing switch-over between open call/secrete call in end-to-end voice telecommunication |
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| WO2009033344A1 (en) * | 2007-09-13 | 2009-03-19 | Zte Corporation | Method and system for realizing nonloss transmission of media stream after switching between open call and secret call |
| CN101237620B (en) * | 2008-02-27 | 2011-12-07 | 中兴通讯股份有限公司 | Transmission method and media gateway for impulse coding modulation code stream |
| CN103297960A (en) * | 2012-03-02 | 2013-09-11 | 宇龙计算机通信科技(深圳)有限公司 | Intelligent terminal anti-eavesdropping method and device and intelligent terminal |
| CN104753889A (en) * | 2013-12-31 | 2015-07-01 | 北京大唐高鸿软件技术有限公司 | Method for switching encryption by using SIP protocol |
| CN104994213A (en) * | 2015-03-19 | 2015-10-21 | 数据通信科学技术研究所 | Method and system of realizing mobile terminal encrypted conversation business voice prompt |
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| JP2000115153A (en) * | 1998-09-30 | 2000-04-21 | Fujitsu Ltd | Security method and security device |
| EP1249964A3 (en) * | 2001-04-12 | 2004-01-07 | Matsushita Electric Industrial Co., Ltd. | Reception terminal, key management apparatus, and key updating method for public key cryptosystem |
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| CN104753889A (en) * | 2013-12-31 | 2015-07-01 | 北京大唐高鸿软件技术有限公司 | Method for switching encryption by using SIP protocol |
| CN104994213A (en) * | 2015-03-19 | 2015-10-21 | 数据通信科学技术研究所 | Method and system of realizing mobile terminal encrypted conversation business voice prompt |
| CN105577634A (en) * | 2015-07-31 | 2016-05-11 | 宇龙计算机通信科技(深圳)有限公司 | Encrypted conversation communication establishing failure processing method and user terminals |
| CN105577634B (en) * | 2015-07-31 | 2019-11-12 | 宇龙计算机通信科技(深圳)有限公司 | A kind of processing method and user terminal of the failure of encrypted word connection setup |
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