Call Pick Up issue in T20 & T26

[pklobasa]

Hello,

I have noticed issue with the call pick up feature in Yealink T20 & T26 with BW releases 9.71.193.6 & 6.71.193.6.

Technically calls are disconnected by SIP BYE request from phones a few seconds after ACK with SDP is receive from BW AS. The call flow is :

UA (phone) <-> BW AS
->INVITE with call pickup FAC ->
<- 100 Trying<-
<- 200OK SDP<-
-> ACK->
<- INVITE without SDP to trigger a new media offer <-
-> 100 Trying ->
-> 200OK with SDP offer->
<- ACK with SDP answer <-
.....few seconds without any action...
-> BYE ->

If I check debug logs I don't see any indication why call pick up service with a new media offer isn't processed. There are only these lines:

Nov 20 17:08:17 Log [372]: SCRN<6+info > SCREEN_MSG_LIGHT_STATUS_CHANGE[0xffffff][0x0]
Nov 20 17:08:17 Log [372]: SCRN<6+info > Open back light Time[16777215] Level[2].
Nov 20 17:08:17 Log [502]: TALK<6+info > talkui Action to logic [iSessionID=1][iActionType=2][wP=130][lP=0]
Nov 20 17:08:17 Log [502]: VOIC<6+info > CVoiceManager::OnKeyPress iKey=130
Nov 20 17:08:17 Log [502]: TALK<6+info > talkui Action to logic [iSessionID=1][iActionType=8][wP=1][lP=0]
Nov 20 17:08:17 Log [502]: CUIT<6+info > PostMSGToSIPThread: Post Msg[40004] to sip thread0:[1554924375][0]
Nov 20 17:08:17 Log [502]: TALK<6+info > CSessionManager::DeleteSession start
Nov 20 17:08:17 Log [502]: TALK<6+info > CSessionManager::DeleteSession delete pSession [ID:1]
Nov 20 17:08:17 Log [502]: TALK<6+info > CSingleSession::SaveCallHistory [1][16]

Please check attached traces and debug logs.

Thank you in advance.

Petr

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Unfortunately I can't attach pcap trace in this forum