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• Media Gateway Control Function
– Call control protocol conversion (SIP to ISDN User Part signalling)
– Media Gateway control
– I-CSCF identification
• Media Gateway
– Media conversion
– Bearer control
– Translation of the AMR Codec data (within IP packets) to 64kbps PCM for the telephone network

The MGCF performs the translation of the protocols from SIP signalling to ISUP (ISDN) User Part signalling for transmission over the PSTN network.
It also selects the appropriate I-CSCF routing as the mobile moves (from information from the PSTN called party routing number)
The MG performs a conversion from the H248 standard which is used to define and modify the media streams.