res_pjsip_session: Send Session Interval too small response

Handle session interval lower than endpoint's configured minimum timer
when sending first answer. Timer setting is checked during this step and
needs to handled appropriately.
Before this change, no response was sent at all. After this change a
response with 422 Session Interval too small is sent to UAC.

diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index de51b680f9e54739979796f72edd7ae32855773c..b5a8b3f54c36e8ad2a88b04029019b5e46e2e459 100644 (file)
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -4053,15 +4053,20 @@ static int new_invite(struct new_invite *invite)
         * so let's go ahead and send a 100 Trying out to stop any
         * retransmissions.
         */
+       if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 100, NULL, NULL, &tdata) != PJ_SUCCESS) {
+               if (tdata) {
+                       pjsip_inv_send_msg(invite->session->inv_session, tdata);
+               } else {
+                       pjsip_inv_terminate(invite->session->inv_session, 500, PJ_TRUE);
+               }
+               goto end;
+       }
+
        ast_trace(-1, "%s: Call (%s:%s) to extension '%s' sending 100 Trying\n",
                ast_sip_session_get_name(invite->session),
                invite->rdata->tp_info.transport->type_name,
                pj_sockaddr_print(&invite->rdata->pkt_info.src_addr, buffer, sizeof(buffer), 3),
                invite->session->exten);
-       if (pjsip_inv_initial_answer(invite->session->inv_session, invite->rdata, 100, NULL, NULL, &tdata) != PJ_SUCCESS) {
-               pjsip_inv_terminate(invite->session->inv_session, 500, PJ_TRUE);
-               goto end;
-       }
        ast_sip_session_send_response(invite->session, tdata);
 
        sdp_info = pjsip_rdata_get_sdp_info(invite->rdata);