JPH0222599B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a PBX dial-in connection system for connecting PBX exchanges of different signaling systems to a switching network based on an end-to-end connection control system.

In the telephone exchange system, it can be broadly divided into End-to-
There are two types: end connection control method and Link-by-link connection control method. Although detailed explanations of these are omitted, the former
This is typified by the R2 signaling system, and the latter is the R1 signaling system.
This is typified by the signaling system.

FIG. 1 is a diagram of a relay system based on a conventional end-to-end connection control system. In figure 1
EX-A is the originating station, EX-B is the terminating station, PBX is the private branch exchange, OS is the outgoing sender, IR is the incoming register, OGT is the outgoing trunk, ICT is the incoming trunk,
Forward signal is the terminating subscriber number (ABCDE) and originating subscriber class (SUB) sent from the originating station to the terminating station.
CLASS), Backward signal indicates that the receiving station is above
The signals (A, A') sent back to the originating station for confirmation when receiving the called subscriber number of the forward signal and the called subscriber status information (B, B') sent back when receiving the calling subscriber class are shown.

Generally, in the case of end-to-end connection control method,
Basically all EX-A (originating station) OS (outgoing sender)
EX-B (terminating station) even if it goes through a relay exchange
As a general rule, it continues to operate until it is connected to a subscriber. That is, EX-A (originating station) basically sends and receives signals to and from a plurality of terminating stations during exchange connection. If these terminating stations are different types of exchanges (general exchange and PBX exchange), even if the Backward signals sent back from the terminating stations are the same signal, the meaning is that one is the called party.
free with mete−ring (A), but the other is called
It can be different like party busy (A′), EX
-A (originating station) has different connection controls depending on whether the terminating station is a general exchange or a PBX exchange. Therefore, when making a dial-in connection to a PBX exchange using a different signaling system, the OS (outgoing sender) of EX-A (originating station) uses the Backward signal returned from EX-B (terminating station) in the general exchange network. It is necessary to distinguish and receive and analyze the Backward signal sent back from the incoming PBX exchange and the Backward signal sent back from the incoming PBX exchange. To do this, it is also necessary to know whether the OS (outgoing sender) is a general call or a PBX dial-in call. As mentioned above, this is EX
During signal reception at -A (originating station), only the OS (outgoing sender) performs connection control operations, and it is the OS that can analyze the differences in the Backward signals sent back from the receiving station. This information etc. must be provided by a common control unit (not shown). In the common control device, the number analysis capacity of the common device (translation device: TLR) may need to be increased depending on how the numbering plan is implemented.

For example, EX-B (terminating station) and PBX have the same station number, and the difference between them is the number in the thousandth or hundredth place (EX-B: ABC (station number) + DEFG (subscriber number),
PBX: In cases where it is necessary to distinguish by ABC (station number) + D'E'FG (subscriber number), EX-A (originating station) receives the Backward signal from the terminating station as described above. Due to the need to analyze
If the receiving station is only a general exchange, that is, only general calls, there is no need to consider PBX calls, so ABC is usually used.
While it is sufficient to analyze (translate) only the (station number), the receiving station
If you have a PBX exchange, access to some of the exchanges is
For PBX calls only, it is necessary to analyze (translate) ABCD′E′ and identify whether it is a general call or a PBX call. For general calls only, AB or
It is sufficient to analyze only the ABC station number, but if there are PBX calls, it is necessary to analyze ABC-D'E' for only some of the PBX calls.

Also, the Backward signals include signals that need to be handled with care, such as non-charging classes, and are therefore dangerous. For example, EX-A
When the (originating station) receives a non-charging class (Backward signal) from the terminating station, the general call is treated as non-billing, and the PBX call is treated as billing. Although it is customary to assume that the name does not exist, the above-mentioned identification is essential for this. If you do not identify yourself, all calls to the PBX switch will be toll-free. Furthermore
The volume of PBX dial-in calls is usually very small compared to the volume of other general calls, so it is extremely economical to add the above functionality to all originating stations, that is, all local stations. This is not a good idea and only unnecessarily complicates the switching network (signaling system).

The purpose of this invention is to solve these problems and to
It provides a connection method that economically introduces dial-in into existing exchange networks.

According to the present invention, an automatic telephone exchange that adopts the R2 (MFC) signaling system and is based on end-to-end connection control accommodates a PBX exchange and allows direct dial-in calls to the PBX exchange. Based on the Link-by-link connection control method as
This is achieved by installing a PBX sender and establishing a dial-in connection through signal control between the PBX sender and the PBX exchange.

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

FIG. 2 is a diagram of a relay system when the present invention is adopted, and FIG. 3 is a diagram of a relay system when the present invention is applied to an existing exchange.

First, referring to FIG. 2, the PBX dial-in connection method of the present invention will be explained. Among the symbols in FIG. 2, the same symbols as those shown in FIG. 1 indicate the same devices as those explained in FIG. OS′ is PBX
Outgoing sender, OGT′ indicates outgoing trunk for PBX,
Some functions are different from other OS and OGT. When dialing is performed from calling telephone subscriber A to call receiving telephone subscriber B, Forward signal
(ABC××××+SUB CLASS) is sent from EX-A (originating station) to EX-B (terminating station). EX-B
(terminating station) is a local exchange that accommodates a PBX exchange, and has as many OS' (PBX-dedicated outgoing senders) as necessary for the volume of PBX dial-in calls, and if necessary, PBX-dedicated outgoing trunks. Equip OGT′. This EX-B (terminating station) is EX-A (originating station).
The forward signal sent from the OS is stored in the IR (input register), and after the M (marker/control device) translates the signal (XXXX), it sends the backward signal (B) from the IR in the case of a general call. It is returned to the station and connected to the subscriber of the own station. On the other hand, in the case of a PBX call, RSL (not shown), OS', and OGT' are selected and captured. And, between EX-B (terminating station) and PBX, forward signal (××××+SUB
CLASS). After the Forward signal is sent from the OS', the EX-B converts the Backward signal (B') returned from the PBX into a general call.
Convert to Backward signal (B) (if it has the same meaning, relay it as is without converting) and pass through RSL (not shown), IR, and ICT to EX-A (originating station)
send it back to That is, in the case of the present invention, EX-B (terminating station)
All signals are sent and received between the EX-B and the PBX exchange.
(receiving station) and the PBX exchange, it is possible to eliminate any influence on other EX-As (originating stations).
The Barkward signal can also be fixed to a certain specific signal and sent back from the IR (input register) of the EX-B (terminating station), thereby simplifying the signaling system.

Figure 3 is a relay system diagram when the present invention is added to an existing exchange, and the PBX is EX-B (terminating station).
OGT' (PBX-dedicated output sender) and OS' (PBX-dedicated output sender) are installed at the existing EX-B (terminating station). Between EX-B (terminating station) and PBX, OS' (PBX exclusive output sender)
Forward signal (×××
×+SUB CLASS). The Backward signal from the PBX exchange is OS′ (output sender for PBX)
It is received by the station and is not sent back to EX-A (the originating station). Returns to EX-A (originating station) are sent from IR (input register).

As explained above, according to the present invention, End-to
-end When connecting a PBX exchange using a different signaling method to a switching network based on the connection control method,
Link− at the terminating exchange that houses the PBX
By-link connection control method is used to connect from PBX.
Backward signal for general call
By converting it into a signal, exchange connection processing can be performed between the originating station and the terminating station without being aware of the PBX call at all. In other words, even when connecting PBXs with different signaling systems, it is possible to prevent the different signaling systems from affecting the entire switching network.Furthermore, the numbering plan, that is, the numbering method for PBX exchanges, is shown in Figure 1. The method includes multi-digit translation for PBX call identification and Backward
Compared to the signal analysis function required, this method
By having the receiving station that houses the PBX perform all of these identification and backward signal analysis functions without affecting the sending station in any way, it is possible to perform them freely without being restricted by the functions of the sending station. Become. This has the effect that the introduction of PBX dial-in calls, which are much smaller than general calls, can be implemented very economically without affecting the existing switching network.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional PBX dial-in connection, Fig. 2 is a block diagram showing an embodiment of the PBX dial-in connection method according to the present invention, and Fig. 3 is a block diagram showing an example of a PBX dial-in connection method according to the present invention. FIG. EX-A...Outgoing exchange, EX-B...Destination exchange, PBX...Private automatic branch exchange, ICT...Incoming trunk, OGT...Outgoing trunk, IR...Incoming register,
OS...Output sender, M...Marker, NG...Number group, TLR...Translator, OS'...
Output sender exclusively for PBX, OGT′...Output trunk exclusively for PBX.

Claims (1)

[Claims] 1 Adopts R2 (MFC) signaling system, End-to-
An automatic telephone exchange based on end connection control accommodates a PBX exchange, and is equipped with a PBX outgoing sender based on a Link-by-link connection control method for direct dial-in calls to the PBX exchange,
A dial-in connection is established by signal control between the PBX output sender and the PBX exchange.
PBX dial-in connection method.