From 822b46a0b253fc7ff70d8d1f8e9178a094c51292 Mon Sep 17 00:00:00 2001
From: paulc <paulc@acf43c95-373e-0410-b603-e72c3f656dc1>
Date: Fri, 24 Aug 2007 23:26:40 +0000
Subject: [PATCH] Allow answering to session refreshes without a SDP offer.

git-svn-id: http://voip.null.ro/svn/yate@1435 acf43c95-373e-0410-b603-e72c3f656dc1
---
 conf.d/ysipchan.conf.sample |  3 +++
 modules/ysipchan.cpp        | 22 ++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/conf.d/ysipchan.conf.sample b/conf.d/ysipchan.conf.sample
index 5bfd207a..e8e9a313 100644
--- a/conf.d/ysipchan.conf.sample
+++ b/conf.d/ysipchan.conf.sample
@@ -67,6 +67,9 @@
 ; multi_ringing: bool: Accept provisional (1xx) messages even after 180 Ringing
 ;multi_ringing=disable
 
+; refresh_nosdp: bool: Accept session refresh reINVITEs that lack a SDP offer
+;refresh_nosdp=enable
+
 
 [registrar]
 ; Controls the behaviour when acting as registrar
diff --git a/modules/ysipchan.cpp b/modules/ysipchan.cpp
index 02ecadea..c24bfb8f 100644
--- a/modules/ysipchan.cpp
+++ b/modules/ysipchan.cpp
@@ -500,6 +500,7 @@ static bool s_forward_sdp = false;
 static bool s_start_rtp = false;
 static bool s_auth_register = true;
 static bool s_multi_ringing = false;
+static bool s_refresh_nosdp = true;
 
 static int s_expires_min = EXPIRES_MIN;
 static int s_expires_def = EXPIRES_DEF;
@@ -2844,6 +2845,26 @@ void YateSIPConnection::reInvite(SIPTransaction* t)
 	Engine::enqueue(msg);
 	return;
     }
+    if (s_refresh_nosdp && !t->initialMessage()->body) {
+	// be permissive, accept session refresh with no SDP
+	SIPMessage* m = new SIPMessage(t->initialMessage(),200);
+	if (!m_rtpForward) {
+	    // if possible provide our own media offer
+	    switch (m_mediaStatus) {
+		case MediaStarted:
+		    m->setBody(createSDP(getRtpAddr()));
+		    break;
+		case MediaMuted:
+		    m->setBody(createSDP(0));
+		    break;
+		default:
+		    break;
+	    }
+	}
+	t->setResponse(m);
+	m->deref();
+	return;
+    }
     t->setResponse(488);
 }
 
@@ -3989,6 +4010,7 @@ void SIPDriver::initialize()
     s_rtpip = s_cfg.getValue("general","rtp_localip");
     s_start_rtp = s_cfg.getBoolValue("general","rtp_start",false);
     s_multi_ringing = s_cfg.getBoolValue("general","multi_ringing",false);
+    s_refresh_nosdp = s_cfg.getBoolValue("general","refresh_nosdp",true);
     s_expires_min = s_cfg.getIntValue("registrar","expires_min",EXPIRES_MIN);
     s_expires_def = s_cfg.getIntValue("registrar","expires_def",EXPIRES_DEF);
     s_expires_max = s_cfg.getIntValue("registrar","expires_max",EXPIRES_MAX);