| 摘要 |
An access system, such as a DSL (Digital Subscriber Line), comprising a multiplexer (20) for connecting subscriber devices, such as telephones (11, 12, 13) and/or IP terminals (14), to a subscriber line (50); and an access multiplexer (30) for connecting subscriber lines (50) to a backbone network (70). When the access system is having a voice call to another system via the telephone system and said other system employs a voice coding method, the access system is arranged to negotiate with the other system a voice codec type to be used in both systems; to transmit an encoded voice signal from the subscriber device (11, 12, 13 or 14) or the multiplexer (20) to the other system and to transmit an encoded voice signal from the other system to the subscriber device or the multiplexer.
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