JPS6322667B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a ring back tone sending system for a digital exchange that can reduce software processing.

When using a message sound source for recording signals such as an announcement machine, it is connected to the trunk of a digital exchange, and that trunk is called a talkie trunk. In Figure 1, which shows the conventional configuration, the incoming trunk ICT, which is directly connected to the subscriber SUB, captures the talkie trunk TKT by the calling subscriber's dial and uses the digital signal until the sound source TG cue signal is obtained. It accepts connection R1 from a ringback tone source RBT. This is because if there is no sound to the calling subscriber after dialing, it is unclear whether the talkie trunk TKT has been captured or not, so the status is notified by sending a ring back tone. The above operations are managed by a central processing unit CPU controlled by software. When the message sound source in the sound source TG is activated, finds the cue signal HIC, and is ready to send a message, the cue signal is sent to the talkie trunk TKT. central processing unit cpu
detects it and connects R in network NWK.
1 to R2. That is, connection R2 is an incoming trunk.
Directly connects ICT and talkie trunk TKT.
Therefore, the analog signal SG from the sound source is converted into a digital signal DS in the talkie trunk TKT, and the digital signal DS is passed through the network NWK. In the incoming trunk ICT, it is converted back into an analog signal and transmitted to the calling subscriber SUB. This operation requires a large amount of software processing, and has the disadvantage that if the message sound source is called frequently, the load on the central processing unit CPU increases rapidly.

The purpose of the present invention is to improve the above-mentioned drawbacks and to provide a ringback system for digital switching equipment in which the connection between the up and down highways and the return circuit in the trunk is devised so as to reduce the amount of software processing required for devices such as message sound sources. The purpose of the present invention is to provide a tone sending method.

Below, FIG. 2 showing an embodiment of the present invention will be explained. In Figure 2, U-HW connects to the network from the talkie trunk TKT on the up-highway.
Transmission line to NWK, D-HW is down highway, transmission line from network to talkie trunk,
SHT is a return line installed in the talkie trunk TKT, GT1, GT2, and GT3 are gates, and LG is an OR circuit. talkie trunk
A ring back tone source RGT is connected in advance to the downhill highway D-HW to TKT via the network NWK. When a call is made from the subscriber SUB to the message tone source TG, the software of the central processing unit CPU obtains a tone source activation signal TGS and also obtains a signal to open the gate GT3 and controls them respectively. Therefore, the ringback tone is transmitted through the gate GT2 forming the turnback line SHT in the talkie trunk TKT, through the OR circuit LG, and then to the network NWK via the up-highway U-HW.
to go into. The calling subscriber SUB therefore knows that the talkie trunk TRK has been captured. When the cue signal HIC is obtained in the next activated power supply TG, the signal controls the gates GT1 and GT2 in the talkie trunk TKT to open the gate GT1 and close the gate GT2. Therefore, the ringback tone is not transmitted to the up-bound highway U-HW, but instead the message sound SG from the sound source TG is converted into analog-to-digital A/D and transmitted to the up-bound highway U-HW.

In place of the network NWK and talky trunk TKT in the above explanation, even when a trunk exchange and a telephone outgoing trunk TEL-OGT are combined, the ring back tone can be transmitted via the down highway to the telephone outgoing trunk. , a ringback tone can be heard in exactly the same manner as described above to an equipment maintenance person who calls a telephone connected to the telephone outgoing trunk.

In this way, according to the present invention, a digital ring back tone source is transmitted to the down highway of the trunk, and the ring back tone is transmitted to the caller using a simple configuration in which the return line is connected or disconnected within the trunk. Can be sent out or cut. Therefore, the software processing is simplified compared to the past, with the main task being to connect the original turning track to the up-bound highway.

[Brief explanation of the drawing]

FIG. 1 is a diagram illustrating a conventional ring back tone sending system, and FIG. 2 is a block diagram showing the configuration of an embodiment of the present invention. SUB...Subscriber, ICT...Incoming trunk, NWK
...Network, RBT...Ring back tone source, CPU...Central processing unit, TKT...Talkie trunk, TG...Message sound source, GT1~
GT3...gate, U-HW...upward highway,
D-HW...Downward highway, SHT...Turning track, TGS...Sound source start signal, HIC...Cueing signal, SG...Message sound.

Claims (1)

[Scope of Claims] 1. In a system in which a ring back tone is sent from a talkie trunk to a caller until a message sound source is activated by a digital exchange, a ring back tone is sent to a downhill highway between a network constituting the digital exchange and the talkie trunk. A back tone transmitter is always connected, and when a caller rings, the talkie trunk connects the down highway to the up highway, sends a ring back tone to the caller, and connects to the talkie trunk. A ring back tone transmission method, characterized in that the connection to the uplink highway is opened and transmission of the ring back tone is stopped in response to an operation start signal from a message sound source that has received a message.