Query regarding Standard/Non-standard encoding names (RFC 3551)

Hi All,
 
What should be the response for the following Add message (as per RFC 3551)
if non-standard codec strings received in Local Descriptor :
 
 Context =  ${
    Add=${
    Media{
    LocalControl  {
     Mode = SendReceive,
     ReservedValue = OFF
     },
     Local {
     v=0
     c=IN IP4 $
     m=audio $ RTP/AVP 98
     a=rtpmap:98 G7231-L/8000/1 ----->[ Here G7231-L is a non-standard codec
string ]
     a=fmtp:98 annexa=no;bitrate=5300
     }
   }
 }
 
Media Gateway should :
1. Respond with the encoding name received in Local descriptor?
or
2. Should send the standard encoding name G723 with the corresponding fmtp
line?
 
Thanks.
 
Regards,
Prerna

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