We can not reliably do P2P bridging with DTMF passing back with compensation if we need to listen for DTMF frames. (issue #8962 reported by caio1982)

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.4@53434 65c4cc65-6c06-0410-ace0-fbb531ad65f3

main/rtp.c

@@ -3227,6 +3227,14 @@ enum ast_bridge_result ast_rtp_bridge(struct ast_channel *c0, struct ast_channel
 		audio_p1_res = AST_RTP_TRY_PARTIAL;
 	}
 
+	/* If the core will need to compensate and the P2P bridge will need to feed up DTMF frames then we can not reliably do so yet, so do not P2P bridge */
+	if ((audio_p0_res == AST_RTP_TRY_PARTIAL && ast_test_flag(p0, FLAG_P2P_NEED_DTMF) && ast_test_flag(p0, FLAG_DTMF_COMPENSATE)) ||
+	    (audio_p1_res == AST_RTP_TRY_PARTIAL && ast_test_flag(p1, FLAG_P2P_NEED_DTMF) && ast_test_flag(p1, FLAG_DTMF_COMPENSATE))) {
+		ast_channel_unlock(c0);
+		ast_channel_unlock(c1);
+		return AST_BRIDGE_FAILED_NOWARN;
+	}
+
 	/* Get codecs from both sides */
 	codec0 = pr0->get_codec ? pr0->get_codec(c0) : 0;
 	codec1 = pr1->get_codec ? pr1->get_codec(c1) : 0;