Multi frequency DTMF support - sender side

webrtc/voice_engine/channel.cc

Index: webrtc/voice_engine/channel.cc
diff --git a/webrtc/voice_engine/channel.cc b/webrtc/voice_engine/channel.cc
index e36e54d07502fbbfa27182c04aea646bd227951d..e0aaabf859901102433e8f1c23a6603c6c6bcc84 100644
--- a/webrtc/voice_engine/channel.cc
+++ b/webrtc/voice_engine/channel.cc
@@ -2297,14 +2297,15 @@ int Channel::SendTelephoneEventOutband(int event, int duration_ms) {
   return 0;
 }
 
-int Channel::SetSendTelephoneEventPayloadType(int payload_type) {
+int Channel::SetSendTelephoneEventPayloadType(int payload_type,
+                                              int payload_frequency) {
   WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, _channelId),
                "Channel::SetSendTelephoneEventPayloadType()");
   RTC_DCHECK_LE(0, payload_type);
   RTC_DCHECK_GE(127, payload_type);
   CodecInst codec = {0};
-  codec.plfreq = 8000;
   codec.pltype = payload_type;
+  codec.plfreq = payload_frequency;
   memcpy(codec.plname, "telephone-event", 16);
   if (_rtpRtcpModule->RegisterSendPayload(codec) != 0) {
     _rtpRtcpModule->DeRegisterSendPayload(codec.pltype);