| 摘要 |
The invention concerns a method for implementing the signalling between a telephone exchange (DX) and a private automatic branch exchange (PABX) in a telecommunication system comprising a telephone exchange (DX) and a private automatic branch exchange (PABX) connected to the telephone exchange. In method of the invention, retransmission of a message sent by the telephone exchange (DX) to the private automatic branch exchange (PABX) is prevented when, based on the message, the private automatic branch exchange (PABX) has returned to the telephone exchange (DX) a response message indicating an error condition or incompatibility. Moreover, the invention concerns a system for implementing the signalling between a telephone exchange and a private automatic branch exchange in a telecommunication system comprising a telephone exchange (DX) and a private automatic branch exchange (PABX) connected to the telephone exchange. The system of the invention comprises means for preventing the retransmission of a message to be sent from the telephone exchange (DX) to the private automatic branch exchange (PABX) when, based on the message, the private automatic branch exchange (PABX) has returned to the telephone exchange (DX) a response message indicating an error condition or incompatibility.
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