SIP_CLNT_CALLING
case SIP_CLNT_CALLING:
if (sip_trans->sip_xaction_state != SIP_CLNT_CALLING)
if (sip_trans->sip_xaction_state == SIP_CLNT_CALLING) {
sip_trans->sip_xaction_state = SIP_CLNT_CALLING;
case SIP_CLNT_CALLING: