Index: main/rtp.c
===================================================================
--- main/rtp.c	(revision 56004)
+++ main/rtp.c	(working copy)
@@ -3144,6 +3144,7 @@
 	enum ast_rtp_get_result audio_p1_res = AST_RTP_GET_FAILED, video_p1_res = AST_RTP_GET_FAILED;
 	enum ast_bridge_result res = AST_BRIDGE_FAILED;
 	int codec0 = 0, codec1 = 0;
+	struct ast_format_list fmt0, fmt1;
 	void *pvt0 = NULL, *pvt1 = NULL;
 
 	/* Lock channels */
@@ -3247,8 +3248,17 @@
 		return AST_BRIDGE_FAILED_NOWARN;
 	}
 
+	fmt0 = ast_codec_pref_getsize(&p0->pref, codec0);
+	fmt1 = ast_codec_pref_getsize(&p1->pref, codec1);
+	if ( fmt0.cur_ms !=  fmt1.cur_ms){
+		if (option_debug)
+			ast_log(LOG_DEBUG, "Codec0 framing = %d is not Codec1 framing = %d, cannot P2P bridge in RTP.\n", fmt0.cur_ms, fmt1.cur_ms);
+                audio_p0_res = AST_RTP_TRY_NATIVE;
+                audio_p1_res = AST_RTP_TRY_NATIVE;
+	}
+
 	/* If either side can only do a partial bridge, then don't try for a true native bridge */
-	if (audio_p0_res == AST_RTP_TRY_PARTIAL || audio_p1_res == AST_RTP_TRY_PARTIAL) {
+	if ((audio_p0_res == AST_RTP_TRY_PARTIAL || audio_p1_res == AST_RTP_TRY_PARTIAL)) {
 		/* In order to do Packet2Packet bridging both sides must be in the same rawread/rawwrite */
 		if (c0->rawreadformat != c1->rawwriteformat || c1->rawreadformat != c0->rawwriteformat) {
 			if (option_debug)