Bug 810353 - Offer Opus as stereo instead of mono, r=ehugg, a=akeybl

media/webrtc/signaling/src/sipcc/core/gsm/gsm_sdp.c

@@ -1211,7 +1211,7 @@ gsmsdp_set_media_attributes (uint32_t media_type, void *sdp_p, uint16_t level,
 
             (void) sdp_attr_set_rtpmap_clockrate(sdp_p, level, 0, a_inst,
             		RTPMAP_OPUS_CLOCKRATE);
-
+            (void) sdp_attr_set_rtpmap_num_chan (sdp_p, level, 0, a_inst, 2);
 
             /* a=fmtp options */
             if (maxavbitrate || maxcodedaudiobw || usedtx || stereo || useinbandfec || cbr) {