We can see this when we call from yate to a to phone number . Its shows as Status 'Call progressing: client/2' in window and can hear the ringing sound.
<ALL> Created DataTranslator 0x2b006002b620 for 'mulaw' -> 'slin' by factory 0x2b0032189c20 (len=1)
<ALL> DataTranslator::attachChain [0x2b0094004850] 'mulaw' -> [0x2b006001d220] 'slin' succeeded
<client:INFO> Dispatching 2 postponed messages
<client:INFO> Status 'Call progressing: client/2' in window (nil)
<WARN> ALSA write underrun occurred
<WARN> ALSA write underrun occurred
But when we call from yate to twinkle on extension we will get there is no CALL PROGESsing status and no ringing. No ALSA write underrun occurred
<client:INFO> Dispatching 2 postponed messages
<client:INFO> Status 'Call ringing: client/3' in window (nil)
<client:INFO> callTerminate(client/3)
<client/3:CALL> msgDrop() reason=cancelled [0x12822d0]
On yate to yate calling below logs
yrtp:ALL> RTP/AVP message received
<yrtp:ALL> Wrapper 0x2b6124029690 found by ID 'yrtp/1391167182'
<yrtp:INFO> YRTPWrapper::terminate() [0x2b6124029690]
>>> DataTranslator::detachChain(0x2b612400acc0,0x2b6118026830)
>>> DataTranslator::detachChain(0x2b612400acc0,0x2b6124010170)
<<< DataTranslator::detachChain
<<< DataTranslator::detachChain
>>> DataTranslator::detachChain(0x2b6118028d10,0x2b6124011610)
>>> DataTranslator::detachChain(0x2b6118028d10,0x2b6124011b50)
<<< DataTranslator::detachChain
<<< DataTranslator::detachChain
<yrtp:ALL> YRTPSource::~YRTPSource() [0x2b612400acc0] wrapper=0x2b6124029690 ts=0
<yrtp:ALL> YRTPConsumer::~YRTPConsumer() [0x2b6124011610] wrapper=0x2b6124029690 ts=77600
<yrtp:ALL> YRTPWrapper::~YRTPWrapper() bidir 'audio' [0x2b6124029690]
<ALL> Cleaning up RTP 0x2b61240226b0 [0x2b6124029690]
<yrtp:ALL> RTP/AVP message received
yrtp:INFO> RTP starting format 'mulaw' payload 0 [0x2b6124029870]
>>> DataTranslator::detachChain(0x2b612400acc0,0x2b6118026830)
<<< DataTranslator::detachChain
<ALL> Created DataTranslator 0x2b6124010170 for 'mulaw' -> 'slin' by factory 0x2b60eb35fc20 (len=1)
<ALL> DataTranslator::attachChain [0x2b612400acc0] 'mulaw' -> [0x2b6118026830] 'slin' succeeded
>>> DataTranslator::detachChain(0x2b6118028d10,0x2b612400f3f0)
<<< DataTranslator::detachChain
<ALL> Created DataTranslator 0x2b6124011b50 for 'slin' -> 'mulaw' by factory 0x2b60eb35fc20 (len=1)
<ALL> DataTranslator::attachChain [0x2b6118028d10] 'slin' -> [0x2b612400f3f0] 'mulaw' succeeded
<yrtp:INFO> Wrapper opened a hole in firewall/NAT [0x2b6124029870
i can see sound data sending because there will be some codes keeps changing like stop watch seconds time fast.