Solved MOH remains after attended transferring outgoing call

[carmen.leroux]

User A: Yealink T40G on firmware v 76.84.0.95 (tried this on different devices)
User B: Yealink T40G, also tested with various cordless models)
3CX PBX on 16.0.8.9

Scenario 1 (it works with an incoming call)
External caller calls user A on direct number
User A answers and announces that caller will be transferred to User B
User A does an attended transfer to User B
User B picks up and confirms with User A that call can be transferred
User A presses Trans
Call ends on User A's side
External caller can now speak with User B

Scenario 2 (it does not work with an outgoing call)
External caller calls user A on direct number
User A answers and announces that I will be transferred to User B
User A does an attended transfer to User B
User B picks up and confirms with User A that call can be transferred
User A presses Trans
Call ends on User A's side
Call remains on User B's side and I can see the call timer counting upwards
External caller hears MOH and nothing happens

 

[carmen.leroux]

I have tested this again by using Blind Transfer rather than Attended/Consultative Transfer and experience exactly the same issue.

Another interesting thing I saw was, after the external call was dropped by the external caller, the call still continues on User B's handset with the timer counting up.



Lastly, I have also logged in to the webclient and under switchboard it still shows the external caller being on a call with User A after User A has transferred the call

 

[VasilisV_3CX]

Hi @carmen.leroux,

From what I can tell the same procedure is followed in Scenario 1 and Scenario 2, meaning that the issue is intermittent?

How have the phones been provisioned? Stun, local etc

 

[carmen.leroux]

Hi @VasilisV_3CX

Thank you for your response. These are Local LAN extensions. The procedure is not the same. Scenario 1 is and incoming call and Scenario 2 is an outgoing call. My mistake making a typo there.

I managed to sort the issue out by disabling "Supports Reinvite" on the SIP trunk.

 

[VasilisV_3CX]

Glad to hear you resolved the issue!