JPH08251284A - Bearer setting method for isdn service - Google Patents

Abstract

PURPOSE: To set plural available bearers through an outgoing terminal when a call is set and to select the bearers at the side of a terminating terminal or a relaying exchange in response to the conditions of the terminating terminal or an ISDN. CONSTITUTION: Plural transmission capability BC and high layer consistency HLC are set to a call setting message received from an originating terminal and transmitted through an originating LS(local system). The capability BC: speech, i.e., a bearer with which a terminating terminal can communicate is selected out of those transmitted capability BC at the terminating terminal via a terminating LS and can be notified to the outgoing terminal. An answer signal including the capability BC: speech and the high layer consistency HLC2 is transmitted to the originating LS from the terminating terminal via the terminating LS and a relaying exchange and then mapped by the originating LS. Then a fact that the capability BC: speech is selected at the terminating terminal is notified to the originating terminal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearer setting method for an ISDN service, and in particular, an ISDN for setting a plurality of bearers that can be set from a calling terminal at the time of call setting in ISDN and selecting at a receiving side terminal or a relay exchange side. It relates to a bearer setting method of a service.

[0002]

2. Description of the Related Art When INS (advanced information and communication system) net services are transitioned, it is expected that terminals having different bearers such as ISDN (Integrated Services Digital Network) terminals, G3 facsimiles, and ordinary telephones will be mixed.

[0003] Thus, even when terminals having different bearers can make a call without being aware of the other party having different bearers, the convenience of the user is improved, and thus, as an INS net service, It is considered that the spread of G4 facsimiles, videophones, high-definition telephones, etc. can be promoted.

[0004]

The conventional bearer setting method is performed according to the sequence shown in FIG.

When the setup signal is issued from the calling terminal, the information element is mapped to the address signal in the calling local system (LS). in this case,
Transmission capability of only one bearer from the originating terminal (64 Kbs /
UDI (unlimited) is mapped. And
The fact that the call has been received by the receiving side LS is transmitted to the receiving terminal through the relay exchange.

However, the receiving terminal is 64k / spec
Since it is h, the bearer cannot communicate with the calling terminal. In such a case, conventionally, the bearer is disconnected because it cannot communicate, and it is returned to the calling terminal as it is.

[0007] As described above, when a bearer is set at the calling terminal at the time of call setting, a signal mapping method and a signal sequence that enable selection of a mode in which the called terminal can communicate are not conventionally specified. It was

The present invention has been made in view of the above-mentioned problems, and a plurality of bearers that can be set from a calling terminal at the time of setting a call in ISDN are set, and the called side terminal or the network can be set according to the conditions of the called side. It is an object of the present invention to provide a bearer setting method for an ISDN service that can be selected on the terminal or transit exchange side.

[0009]

That is, the present invention is based on I
In the SDN call setting method, a step of setting a plurality of bearers in a call setting message from a calling side terminal, a step of sending out the set plurality of bearers, and the above-mentioned sending out at the receiving terminal or the transit exchange. And a step of selecting one bearer from the plurality of selected bearers and a step of responding the selected bearer to the originating terminal and determining a bearer to be used for communication.

[0010]

According to the present invention, in the ISDN call setting method, a plurality of bearers are set and transmitted in the call setting message from the calling terminal. Then, the receiving terminal or the relay exchange selects a bearer with which the receiving terminal can communicate, from the plurality of transmitted bearers, and responds to the transmitting terminal. Thereby, the bearer used for communication can be determined.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

According to the present invention, when a call setup signal in which a plurality of bearers are set up is received from the calling terminal at the time of call setup,
A mode in which the receiving terminal can communicate can be selected depending on the conditions of the receiving terminal and the network. Therefore, the mapping method and the signal sequence of the communication mode (transfer capability (BC) and lower layer compatibility (LLC)) are defined.

FIG. 1 is a diagram showing a fallback sequence in the case of the presence of the speech of the terminating terminal in the first embodiment of the bearer setting method of the ISDN service of the present invention.

In FIG. 1, a plurality of transfer capabilities (BC: speech, 64 Kbs / UDI) and high layer compatibility (HLC: HLC2, HLC1) are set by the calling terminal. Specifically, at the time of call setup of the layer 3 which is the lower layer, the information element of the call setup message is added to the address signal,
That is, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements passes through the transit exchange,
The call is received by the receiving side LS and transmitted to the receiving terminal.

When a call is received by the terminating terminal, it is mapped from the address signal that a plurality of transfer capabilities and higher layer compatibility are set. Then, it is possible to notify the receiving terminal that a bearer with which communication is possible can be selected from a plurality of bearers. In this case, the selected bearer (speech) can notify the calling terminal of the receiving terminal.

Thus, the transmission capability spe is transmitted from the receiving terminal.
ech and response with higher layer compatible HLC2 (C
The ONN) signal is mapped to the response (ANM) signal having TMU (speech) and ATP (HLC2) at the destination LS, and is transmitted to the originating LS via the transit exchange. Then, by the calling side LS, the above response (ANM)
The signal has a transmission capability speech and a higher layer integrity H.
It is mapped to the response (CONN) signal with LC2.

As a result, at the calling terminal, the s
It is notified that the transfer capability of "pech" has been selected.

Next, a second embodiment of the present invention will be described.

FIG. 2 is a diagram showing a fallback sequence in the case where the called terminal 64 kb / s unrestricted (UDI) is specified in the second embodiment of the present invention.

In FIG. 2, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set by the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements passes through the transit exchange,
The call is received by the receiving side LS and transmitted to the receiving terminal.

When an incoming call is made to the terminating terminal, it is mapped from the address signal that a plurality of transfer capabilities and higher layer compatibility are set. Then, it is possible to notify the receiving terminal that a bearer with which communication is possible can be selected from a plurality of bearers. In this case, the selected bearer (64 kb / s UDI) at the receiving terminal can notify the transmitting terminal.

Thus, the transmission capacity from the receiving terminal is 64k.
Reply (CONN) signal with b / s UDI and High Layer Consistency HLC1 is ATP (HLC1) at destination LS
Is mapped to the response (ANM) signal having the value of (1) and transmitted to the originating LS via the transit exchange. And this originating side L
The response (ANM) signal is transmitted by S due to the transmission capacity 64k
It is mapped to the response (CONN) signal with b / s UDI and higher layer integrity HLC1.

As a result, at the calling terminal, 6
It is informed that a 4 kb / s unrestricted (UDI) transfer capability has been selected.

Next, a third embodiment of the present invention will be described.

FIG. 3 is a diagram showing a fallback sequence in the case of no indication from the receiving side in the third embodiment of the present invention.

In FIG. 3, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set by the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements passes through the transit exchange,
The call is received by the receiving side LS and transmitted to the receiving terminal.

When an incoming call is made to the terminating terminal, it is mapped from the address signal that a plurality of transfer capabilities and higher layer compatibility are set. Then, it is possible to notify the receiving terminal that a bearer with which communication is possible can be selected from a plurality of bearers.

If no bearer capable of communication is selected at the receiving terminal, a response (CONN) signal is transmitted to the receiving side LS. In this case, the bearer is decided by the network and the destination L
At S, TMU (speech) and ATP (HLC)
It is mapped to a response (ANM) signal having 2), is transmitted to the originating LS via the transit exchange, and the selected bearer can be notified to the originating terminal.

At the originating LS, the response (ANM) signal is a transfer capability speech and higher layer compatible HLC.
2 is mapped to the response (CONN) signal with 2.

As a result, the originating terminal can notify the bearer selected in the network even if the bearer communicable with the receiving terminal is not selected and is not specified.

Next explained is the fourth embodiment of the invention.

FIG. 4 shows a fourth embodiment of the present invention, which is MF
It is a figure showing the fallback sequence in the case of interworking to a line.

In FIG. 4, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set from the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements passes through the transit exchange,
The call is received by the receiving side LS and transmitted to the receiving terminal.

Here, the distance between the relay exchange and the destination LS is M
If the line is an F line and interworking is performed on this line, a ringing signal is transmitted from the activation signal to the receiving terminal via the receiving side LS. Then, from this receiving terminal, the receiving side LS
A response signal is transmitted from the off-hook signal to the transit exchange via the.

On the other hand, in the repeater exchange, the progress display signal including the progress content (PI) # 1 together with the response signal is
It is returned to the calling terminal via the calling side LS. This allows
Notified that the call is not ISDN end-end.

Next explained is the fifth embodiment of the invention.

FIG. 5 is a diagram showing a fallback sequence in the case of interworking to an analog interface in the fifth embodiment of the present invention.

In FIG. 5, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set from the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements passes through the transit exchange,
The call is received at the receiving side LS.

Here, when the receiving terminal is analog and interworkes with the analog interface, the ringing signal is transmitted from the receiving side LS to the analog receiving terminal. Then, an off-hook signal is transmitted from the analog receiving terminal to the receiving side LS.

Further, a response signal (ANM) is transmitted from the called side LS to the calling side LS via the transit exchange. Then, a progress display signal including the progress content (PI) # 2 is returned from the calling side LS to the calling terminal. This notifies that the called terminal is the non-ISDN destination address.

Next explained is the sixth embodiment of the invention.

FIG. 6 is a diagram showing a fallback sequence when the calling side LS recognizes an incoming call to an analog service in the sixth embodiment of the present invention.

In FIG. 6, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set by the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

At the time of receiving the call setting signal having these information elements, when the incoming call to the analog service is recognized by the originating LS (specific dial number: 1XY, etc.), the address signal (IAM) indicates the call path. Request display (TMR: speed)
ch), user service information (USI: spec)
h), access transfer parameter (ATP (HLC2))
Is set. When the address completion signal is received, the progress display signal including the progress content (PI) # 5 is returned to the calling terminal. Thereby, the bearer of the speech notifies that the call connection will be continued.

Next explained is the seventh embodiment of the invention.

FIG. 7 is a diagram showing a fallback sequence when the transit exchange recognizes an incoming call to an analog service in the seventh embodiment of the present invention.

In FIG. 7, a plurality of transfer capabilities (speech, 64 Kbs / UDI) and high layer compatibility (HLC2, HLC1) are set by the calling terminal. That is, when the call setup signal is received, it is possible that a plurality of transfer capabilities and higher layer compatibility are mapped to the address signal.

Then, the originating local system (L
In S), the information element is set to the address signal (IAM). This address signal is used as a call path request indication (TM
R: 64 kb / s pref, TMR ': peak
h), user service information (USI: speech, U)
SI ′; 64 kb / s), access transfer parameter (A
TP (HLC2, HLC1)). The address signal having these information elements is transmitted to the next exchange through the transit exchange.

Here, when the transit exchange recognizes that the incoming call is an analog service (dial Q, free dial, etc.), the progress contents (PI) are displayed together with the response signal.
The progress display signal including # 5 is returned to the calling terminal.
Thereby, the bearer of the speech notifies that the call connection will be continued.

Upon reception of the address completion signal from the next exchange, TMU: speech is set in the transit exchange and the TMU: speech is transmitted to the originating LS. Then, at the calling side LS, when the address completion signal in which TMU: speech is set is received, the progress display signal including the progress content (PI) # 2 is returned to the calling terminal. This notifies that the called terminal is the non-ISDN destination address.

As described above, even if a plurality of bearers that can be set from the calling terminal are set at the time of call setting, communication is not lost at the receiving terminal or the network and the bearer is not disconnected, and the receiving terminal or the network conditions In addition, bearers can be selected to enable communication.

[0057]

As described above, according to the present invention, the ISD
In N, a bearer setting method for the ISDN service, in which a plurality of bearers that can be set from the calling terminal at the time of call setting, are set and can be selected at the called terminal or the transit exchange side according to the conditions of the called terminal or network Can be provided.

[Brief description of drawings]

FIG. 1 is a diagram showing a fallback sequence in the first embodiment of a bearer setting method of an ISDN service according to the present invention in the case where a terminating terminal speech is explicitly indicated.

FIG. 2 shows a second embodiment of the present invention in which a receiving terminal 64 kb
FIG. 7 is a diagram showing a fallback sequence when / s unrestricted (UDI) is explicitly indicated.

FIG. 3 is a diagram showing a fallback sequence in the case of no indication from the called side in the third embodiment of the present invention.

FIG. 4 is a diagram showing a fallback sequence in the case of interworking to an MF line in a fourth embodiment of the present invention.

FIG. 5 is a diagram showing a fallback sequence in the case of interworking to an analog interface in the fifth embodiment of the invention.

FIG. 6 is a diagram showing a fallback sequence when a calling side LS recognizes an incoming call to an analog service in a sixth example of the present invention.

FIG. 7 is a diagram showing a fallback sequence when the transit exchange recognizes an incoming call to an analog service in the seventh embodiment of the present invention.

FIG. 8 is a diagram showing a fallback sequence of a conventional bearer setting method for an ISDN service.

[Explanation of symbols]

ATP ... access transfer parameter, BC ... transmission capability, H
LC ... Higher layer compatibility, TMR ... Call path request display, U
SI ... User service information.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hiromichi Kasahara 1-1-6 Uchisaiwaicho, Chiyoda-ku, Tokyo Nihon Telegraph and Telephone Corporation

Claims (7)

[Claims] 1. In the ISDN call setting method, a step of setting a plurality of bearers in a call setting message from a calling side terminal, a step of transmitting the set plurality of bearers, and a called terminal or a relay exchange. , A step of selecting one bearer from the plurality of transmitted bearers, and a step of determining the bearer to be used for communication by responding the selected bearer to the originating terminal. A method for setting a bearer for an ISDN service, characterized by: 2. The step of selecting the bearer is characterized in that the bearer capable of being communicated with by the called terminal is selected from the plurality of transmitted bearers by the called terminal or transit exchange. 1. The bearer setting method of the ISDN service according to 1. 3. The bearer deciding step according to claim 1, wherein the bearer is decided by a network including the transit exchange when the bearer is not selected in the bearer selecting step. Method for setting up bearer for ISDN service. 4. The step of determining the bearer, when the relay exchange and the receiving terminal are connected by an MF line, returns a display signal of progress contents to the transmitting terminal by a network including the relay exchange. The bearer setting method of the ISDN service according to claim 1, wherein the bearer is determined by determining the bearer. 5. The step of determining the bearer, when the receiving terminal is an analog receiving terminal, returns a display signal of the progress content to the transmitting terminal by a network including the transit exchange to determine the bearer. The bearer setting method of the ISDN service according to claim 1. 6. The step of determining the bearer, when a call to an analog service is recognized when transmitting the plurality of bearers, transmits a display signal indicating the progress content by a network including the transit exchange. The ISD according to claim 1, wherein the ISD is returned to the terminal and connected by a predetermined bearer.
N service bearer setup method. 7. The step of determining the bearer, when the relay exchange recognizes an incoming call to an analog service, returns a progress signal to the originating terminal by a network including the relay exchange. The method for establishing a bearer for an ISDN service according to claim 1, wherein the bearer is connected by a predetermined bearer.