From e4e1742da677b722a591f74cde66caa4b5000c04 Mon Sep 17 00:00:00 2001
From: Donat Zenichev <dzenichev@sipwise.com>
Date: Fri, 25 Jul 2025 13:27:41 +0200
Subject: [PATCH] MT#63298 AmB2BSession: introduce `getMediaPort()`

Introduce AmSdp port getter.
Just takes the first available port which is > 0.

Change-Id: I49a4b850219c64d4720dafb3684dc9d11fa4594f
---
 core/AmB2BSession.cpp | 15 +++++++++++++++
 core/AmB2BSession.h   |  3 +++
 2 files changed, 18 insertions(+)

diff --git a/core/AmB2BSession.cpp b/core/AmB2BSession.cpp
index 2cfedd36..f32dba08 100644
--- a/core/AmB2BSession.cpp
+++ b/core/AmB2BSession.cpp
@@ -302,6 +302,21 @@ void AmB2BSession::addFakeSDPbasedOnPort(const AmMimeBody *src_sdp, AmMimeBody &
   createFakeReply(&fake_mimebody, new_body);
 }
 
+unsigned int AmB2BSession::getMediaPort(const AmSdp& sdp)
+{
+  unsigned int result = 0;
+
+  for (auto it = sdp.media.begin(); it != sdp.media.end(); ++it)
+  {
+    /* must be a legal port which must also not be ICE dummy port */
+    if (it->port > 0 && it->port != 9) {
+      result = it->port;
+      break;
+    }
+  }
+  return result;
+}
+
 void AmB2BSession::acceptPendingInvite(AmSipRequest *invite)
 {
   // reply the INVITE with fake 200 reply
diff --git a/core/AmB2BSession.h b/core/AmB2BSession.h
index 3bce1913..33090c88 100644
--- a/core/AmB2BSession.h
+++ b/core/AmB2BSession.h
@@ -213,6 +213,9 @@ private:
   /** create fake AmSipReply. SDP body based on SDP offer, but with a desired port */
   void addFakeSDPbasedOnPort(const AmMimeBody *src_sdp, AmMimeBody &new_body, unsigned int& desired_port);
 
+  /** get the first available media port */
+  unsigned int getMediaPort(const AmSdp& sdp);
+
   /** generate 200 SIP reply on a pending INVITE (uses fake body) */
   virtual void acceptPendingInvite(AmSipRequest *invite);