JP2905333B2 - Communication control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a communication control device,
In particular, line currents from analog switching networks, dial tones,
The present invention relates to a communication control device that performs call control by recognizing a polarity inversion signal and / or a ringback tone.

2. Description of the Related Art In recent years, as facsimile mail systems such as those shown in FIG. When a communication service is provided via the facsimile mail device 2, it is becoming essential to provide a function for realizing automation and labor saving of the communication.

[0003] For this reason, a communication control device 4 for automatically sending and receiving calls to and from the analog switching network 3 is connected to the mail device 2. However, depending on the quality and specifications of the connected analog switching network 2, the communication control device 4 may be used. In the call connection / disconnection processing in the above, there is a case where a signal from the analog switching network 2 cannot be recognized well and a call control abnormality occurs, and a function for automatically and accurately performing such a call control is required as the communication control device 4. It has become.

[0004]

2. Description of the Related Art In a conventional communication control device 4 in a communication service system as shown in FIG. 5, a call request from a mail device 3 is made off-hook as shown in FIG. From 2, the confirmation of line current, confirmation of dial tone detection, dialing, detection of polarity reversal signal indicating connection to the analog switching network, or confirmation of non-detection (end) of ring back tone "lean lean" The call control process to be performed is performed based on the exact procedure based on the specifications of the analog switching network 2.

[0005]

However, if the analog switching network 2 to be connected is a private branch exchange network or performs international communication, the line current and dial tone expected within the expected time from the analog switching network 2 will be reduced. Since the response signal of the polarity inversion and the ring back tone is not returned, the above-described detection confirmation may not be performed, so that a processing error occurs and communication may not be performed.

[0006] Such a processing error has occurred not only at the time of calling processing but also at the time of receiving processing.

As described above, when the communication control device is connected to a switching network having a specification different from that of the switching network or an extremely low quality, the response signal monitoring time should be extended corresponding to the switching network, or the monitoring time should be increased. Has to be stopped, and the software installed in the communication control device has to be changed. Further, even when the communication control device is connected to a switching network conforming to the switching network, there has been a problem that a processing delay occurs due to a slight delay time of a signal from the switching network.

Accordingly, the present invention provides a communication control apparatus which can normally process incoming and outgoing calls and has high processing reliability even when connected to an analog switching network which is not strictly based on the public switching network. With the goal.

[0009]

In view of the above objects, FIGS. 1 to 3 show a call control principle flow of a communication control apparatus according to the present invention applied to a communication service system as shown in FIG. FIG. 1 shows an outgoing call process (for example, a process when a call request is received from the mail device 3 shown in FIG. 5), FIG. 2 shows an incoming call process, and FIG. 3 shows a line disconnection recognition process. Is shown.

First, in the case of the calling processing shown in FIG. 1, after off-hook is performed, detection of line current, detection of dial tone, dialing, detection of polarity reversal signal, and ring back from the analog switching network 2 are performed. When each process of tone end confirmation is performed, even if line current detection confirmation or dial tone detection confirmation cannot be performed within the fixed times t1 and t2 (−1 and −1), respectively, the response delay of the analog switching network, In order to cope with different tone frequencies or the like, the following procedure, dialing, is performed.

Further, after dialing, the polarity inversion signal is output.
Signal detection and ringback tone not detected (end
When the confirmation cannot be made within a certain time t3 ( −2)
But is ringback tone detected at least once?
(-1) or line current and dial tone
Is not detected first (−3), the fixed time t3Passage
Line current detected and confirmed at time (-2)If done(-
4) There is no abnormality in the line, but the polarity is reversed in the analog switching network.
Since there is no response function, the polarity reversal response
Will be recognized as not being connected to
You. However, if the line current cannot be detected and confirmed (-
4), it is determined that the call has failed due to disconnection (-8).

If the detection cannot be confirmed by the above procedures, the corresponding flag is turned on (−2, −2).
2, -5, -6), and if that could detect check proceeds at that time to the next procedure, notifies the other terminal connected with the flag information to the host software when it recognizes the partner terminal connection (- 7) Things.

On the other hand, in the case of the incoming call processing, as shown in FIG. 2, after off-hook ( S2 ) by detecting a ringer from the analog switching network ( S1 ) , confirmation of the line current ( S3 ) results in connection of the other terminal. Is recognized for a certain period of time t1 (S4).
Ringer is already detected even if line current cannot be detected inside ( S
1 ) It is assumed that there is no abnormality in the line
Similar to the call processing and on the flag of the line current undetected
(S5), notifies the host software of the connection of the partner terminal (S6).

Further, in the case of the disconnection recognition process, as shown in FIG. 3, after the connection with the partner communication terminal is recognized (S11), the line current, the busy tone, and the polarity inversion are monitored (S12, S12).
15, S17), a line disconnection is recognized when line current interruption is detected over a fixed continuous time t5 (S13) set sufficiently longer than the expected momentary interruption time or when a busy tone / polarity inversion is detected. Then, the corresponding flag is turned on (S14, S16, S18), and when notifying the host software of the line disconnection, the disconnection recognition reason is also notified together with any of the three reasons (S19).

As described above, in the communication control apparatus according to the present invention, when the analog switching network returns a response signal properly, prompt call control processing can be performed, and when the signal response from the analog switching network is delayed. Also, even when the tone frequency of the analog switching network is different or the analog switching network does not have a polarity reversal response function, incoming and outgoing calls are processed in a normal procedure, and connection to the partner terminal becomes possible. In addition, even if the terminal is not connected to the destination terminal and it is recognized that the destination terminal connection is normal, the call can be recovered by monitoring the line disconnection, Since each recognition reason is notified to the higher-level software, the higher-level software can perform verification when a line connection / disconnection abnormality occurs frequently.

[0016]

4 (a) and 4 (b) show an embodiment of the processing when the call control processing of the communication control apparatus according to the present invention shown in FIG. 1 is normal and when the line is disconnected, respectively. There is a case where this is applied to the facsimile mail system shown in FIG. 5 and will be described below with reference to FIG.

First, the analog switching network 2 shown in FIG. 5 has no polarity reversal response function and a tone signal frequency of 500 Hz, and sends a facsimile mail from the mail device 3 to the facsimile terminal 1. When the transmission is to be performed, a call is made to the analog switching network 2. However, if the line on the communication control device 4 side is disconnected halfway, the monitoring of the time t1 is started after the call is started (after the off-hook). When the line current is detected and confirmed within this time t1 (FIG. 4A), the process shifts to dial tone monitoring, and when the line current is not detected and confirmed within time t1 (-1). Also in (b) of FIG. 11, the line current non-detection flag is turned on (−2), and the process shifts to dial tone monitoring in the same manner.

The monitoring of the dial tone is performed within the time t2 (-1). When the dial tone from the analog switching network 2 is detected and confirmed (FIG. 2A), the tone frequency of the analog switching network 2 is determined. Is, for example, 500 Hz, and 4
When the communication control device 4 monitoring the 00 Hz tone cannot detect and confirm the dial tone (FIG. 4B), the dial tone non-detection flag is turned on (-2), and after the time t2 has elapsed. , Dialing.

Thereafter, the terminal 1 receives an incoming call.
The communication timing is fast, and the analog switching network 2 is linked to the calling side.
The connection is completed before returning the
4 can detect both polarity reversal response and ringback tone
If not, at least the line current is detected and confirmed.
(-4), After the lapse of time t3 ( Connect to -2)
And notifies the higher-level software (Fig. (A);
-7)).

If the line on the communication control adapter side is broken in the middle, neither line current nor dial tone can be detected, dialing is performed after the lapse of t1 + t2, and after this dialing, the polarity is changed as described above. When neither a reverse response nor a ringback tone can be detected,
The line current is monitored again at the time point (3) after the elapse of the time t3 (-4). In this case, since the line current cannot be detected, the upper software is notified of the call failure due to the line current non-detection (FIG. );-8)).

[0021]

As described above, according to the communication control apparatus of the present invention, even if the line current, dial tone, polarity inversion signal, and / or ring back tone from the analog switching network cannot be detected and confirmed, In order to process incoming and outgoing calls to and from the analog switching network, if the specifications of the analog switching network conform to the public, quick and accurate call control is possible, and In the case where the signal transmission timing and the frequency of the tone signal are out of the specified values of the public analog switching network and the case where there is no polarity reversal response function, connection processing with the opposite terminal can be performed for both outgoing / incoming calls, , enhanced since it allows to provide useful information on the cause analysis when an abnormality occurs in the call control, the versatility of the device is to dramatically improve Rutotomoni, maintenance functions Since leads, which greatly contributes against stable automatic operation of the system.

[Brief description of the drawings]

FIG. 1 is a flow chart showing in principle the calling process of a communication control device according to the present invention.

FIG. 2 is a flow chart showing in principle the incoming call processing of the communication control device according to the present invention.

FIG. 3 is a flowchart showing the principle of disconnection recognition processing of the communication control device according to the present invention.

FIG. 4 is a time chart showing one embodiment of a calling process of the communication control device according to the present invention.

FIG. 5 is a block diagram showing a facsimile mail system to which the present invention and a conventional communication control device are applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Facsimile terminal 2 Analog switching network 3 Facsimile mail device 4 Communication control device In the drawings, the same symbols indicate the same or corresponding parts.

────────────────────────────────────────────────── (5) References JP-A-5-183650 (JP, A) JP-A-59-85173 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H04M 11/00 -11/10

Claims (6)

(57) [Claims] 1. A communication control device for recognizing a line current from an analog switching network and performing call control, wherein undetected information is stored even if a line current after off-hook is not detected within a predetermined time at the time of calling . In the state, the procedure moves to the next step of calling, and finally,
Notify the undetected information together with the connection
A communication control device for notifying a call failure when a call is made. 2. After detecting or not detecting the line current, when the dial tone is recognized and call control is performed, even if the dial tone is not detected within a predetermined time.
Move to the next procedure for calling with the undetected information saved
Eventually, the higher-level software
2. The communication control device according to claim 1, wherein both of them notify the undetected information . 3. After the line current and dial tone are detected or not detected, when dialing is performed, a polarity inversion signal from the analog switching network is not detected within a predetermined time and a ringback tone is not detected. 3. The communication control device according to claim 2, wherein in the case of (1), when a ringback tone has already been detected one or more times, it is recognized as being connected to the communication terminal of the other party. 4. After detecting or not detecting the line current and the dial tone, when the dialing is performed, the polarity inversion signal from the analog switching network is not detected within a predetermined time and the ring back tone is not detected. In this case, even if the line current and the dial tone have not been detected, if the line current is detected at this point, it is recognized that the connection has been made to the partner communication terminal, and if the line current has not been detected, the disconnection has occurred. The communication control device according to claim 2, wherein the communication control device recognizes that: 5. A communication control device for recognizing a line current from an analog switching network and performing call control, wherein at the time of an incoming call, after an off-hook by detection of a ringer from the analog switching network, the other terminal is set within a predetermined time by the line current. A communication control apparatus characterized in that a line is not abnormal even if connection cannot be detected and confirmed, and the higher-level software is notified of the connection of the partner terminal. 6. A communication control device for recognizing a line current from an analog switching network and performing call control, after recognizing a connection with a partner communication terminal, monitors a line current, a busy tone, and a polarity inversion signal, and performs a constant continuous time. Recognize line disconnection when detecting line current disconnection, or when detecting a busy tone or polarity inversion signal,
One of the times when you notice a line disconnection to the higher software
A communication control device for notifying with a reason indicating whether line disconnection has been recognized.