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In CM request service MS> MSC server via A interface MS specifies codecs supported by BSS.
In set up MS>MSC server MS specifies same codec.
In Assignment request MSC Server>BSS MSC specifies MSC supported codec list offered to BSS
In Assignment complete BSS>MSC server BSS give selected codec list.

Codecs supported by the core network are specified by codec capability in MGW, how does the MSC server choose codecs to be contained in Assignment request message.

Gurus help out.....