Opened 17 years ago

Closed 17 years ago

Last modified 17 years ago

#416 closed enhancement (fixed)

Allow application to handle sending ACK manually

Reported by: bennylp Owned by: bennylp
Priority: normal Milestone: release-0.9.0
Component: pjsip Version: trunk
Keywords: Cc:
Backport to 1.x milestone: Backported:


Please see "3PCC call transfer implementation" thread on PJSIP mailing list archive for discussion (

Change History (2)

comment:1 Changed 17 years ago by bennylp

  • Resolution set to fixed
  • Status changed from new to closed

Implemented in r1598:

  • Added on_send_ack() callback in pjsip_inv_callback to let application handle ACK transmission manually.
  • Added pjsip_inv_create_ack() to create the ACK request.

comment:2 Changed 17 years ago by bennylp

Here's a snippet to use the callback and to send ACK:

static int saved_cseq;

static void on_send_ack(pjsip_inv_session *inv, pjsip_rx_data *rdata)
    if (saved_cseq == 0)
	saved_cseq = rdata->msg_info.cseq->cseq;

static void send_the_ack(pjsip_inv_session *inv)
  pjsip_tx_data *ack;
  pj_status_t status;

  // See if we need to send SDP with the ACK	
  if (pjmedia_sdp_neg_get_state(inv->neg)==PJMEDIA_SDP_NEG_STATE_REMOTE_OFFER) {
    pjsip_inv_set_sdp_answer(inv, answer);

  // Create and send ACK
  status = pjsip_inv_create_ack(inv, saved_cseq, &ack);
  if (status == PJ_SUCCESS)
     pjsip_inv_send_msg(inv, ack);
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