From: Joshua Colp <jcolp@digium.com>
Date: Tue, 18 Sep 2018 11:08:24 +0000 (+0000)
Subject: res_pjsip_session: Don't add declined stream if one does not exist.
X-Git-Tag: 15.7.0-rc1~43^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5626b8ecaecf83f5d600a1aca6915e18a6bb0e5a;p=thirdparty%2Fasterisk.git

res_pjsip_session: Don't add declined stream if one does not exist.

Given a scenario where a session refresh was done with a removed
stream we would always add a removed stream to the outgoing SDP
even if one did not already exist.

This change makes it so that a removed stream is only placed into
the SDP if one already exists.

ASTERISK-28047

Change-Id: Ibb97d21cdeb87a8acae0c720861b0ff255708442
---

diff --git a/res/res_pjsip_session.c b/res/res_pjsip_session.c
index 1f9a38232b..68dcf06320 100644
--- a/res/res_pjsip_session.c
+++ b/res/res_pjsip_session.c
@@ -1573,6 +1573,11 @@ int ast_sip_session_refresh(struct ast_sip_session *session,
 
 				/* No need to do anything with stream if it's media state is removed */
 				if (ast_stream_get_state(stream) == AST_STREAM_STATE_REMOVED) {
+					/* If there is no existing stream we can just not have this stream in the topology at all. */
+					if (!existing_stream) {
+						ast_stream_topology_del_stream(media_state->topology, index);
+						index -= 1;
+					}
 					continue;
 				}