HMP 183 Session Progress No SDP

Hi,

I am trying to answer with 183 Session Progress with SDP on INCOMING invite.

I am able to send 183 Session Progress but SDP is always 0 .

unsigned short acceptcode=183;
 
if(gc_util_insert_parm_val(&parmblkp,IPSET_SIP_RESPONSE_CODE,IPPARM_ACCEPT_RESP_CODE,sizeof(unsigned short),acceptcode) <0)
{
return -1;
}
if(gc_SetConfigData(GCTGT_CCLIB_NETIF,ip_board,parmblkp,0,GCUPDATE_IMMEDIATE,&t,EV_ASYNC) <0) {
return -1;
}

After that on incoming call i call cal gc_AcceptCall()  i get 183 message but no sdp .

System that i work on is Linux HMP 4.1 . 

Any Suggestions ?