int call_answer(struct call *call, uint16_t scode)
{
struct mbuf *desc;
int err;
if (!call || !call->sess)
return EINVAL;
if (STATE_INCOMING != call->state) {
return 0;
}
info("answering call from %s with %u\n", call->peer_uri, scode);
if (call->got_offer) {
err = update_media(call);
if (err)
return err;
}
err = sdp_encode(&desc, call->sdp, !call->got_offer);
if (err)
return err;
err = sipsess_answer(call->sess, scode, "Answering", desc,
"Allow: %s\r\n", uag_allowed_methods());
mem_deref(desc);
return err;
}
void tcsipcall_control(struct tcsipcall*call, int action)
{
int err;
struct mbuf *mb = NULL;
/*
* XXX: drop bytes when confirmation received
* */
switch(action) {
case CALL_ACCEPT:
if(call->cstate & (CSTATE_ERR|CSTATE_EST))
return;
if(call->cdir != CALL_IN)
return;
if(! (call->cstate & CSTATE_ICE)) {
DROP(call->cstate, CSTATE_RING);
return;
}
// 200
err = tcmedia_offer(call->media, call->msg->mb, &mb);
if(err) {
DROP(call->cstate, CSTATE_RING);
err |= CSTATE_ERR;
break;
}
/*
* Workarround
*
* libre uses msg->dst to fill in Contact header
* value.
* This works well for UDP where one socket used
* for both send and recieve, but no for TCP
* TCP transport uses one socket for listen
* and other to connect to registar.
* Address msg->dst is the recieving part
* of upstream socket UAC->REGISTAR
* and cannot be used to connect from outside
*
* */
sa_set_port((struct sa*)&call->msg->dst, sa_port(&call->uac->laddr));
sipsess_answer(call->sess, 200, "OK", mb, NULL);
mem_deref(mb);
DROP(call->cstate, CSTATE_RING);
call->cstate |= CSTATE_EST;
break;
case CALL_REJECT:
case CALL_BYE:
if( TEST(call->cstate, CSTATE_IN_RING) ) {
sipsess_reject(call->sess, 486, "Reject", NULL);
DROP(call->cstate, CSTATE_IN_RING);
call->reason = CEND_HANG;
}
if( TEST(call->cstate, CSTATE_EST) ) {
// bye sent automatically in deref
DROP(call->cstate, CSTATE_EST);
call->reason = CEND_OK;
}
if( TEST(call->cstate, CSTATE_OUT_RING ) ) {
// cancel
DROP(call->cstate, CSTATE_EST);
call->reason = CEND_CANCEL;
}
tcsipcall_hangup(call);
break;
}
}
