| 摘要 |
An access system, such as a DSL (Digital Subscriber Line), includes a multiplexer for connecting subscriber devices, such as telephones and/or IP terminals, to a subscriber line; and an access multiplexer for connecting subscriber lines to a backbone network. The access system may also include a gateway for connecting the backbone network to a first system. When the access system receives a voice call to a second system via the telephone system and the first system employs a voice coding method, the access system is arranged to negotiate with the second system a type of voice codec to be used in both the first and second system. The access systems is configured to transmit an encoded voice signal from the subscriber device or the multiplexer to the first system and to transmit an encoded voice signal from the first system to the subscriber device or the multiplexer.
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