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MiVoice Office 250/Mitel 5000 / Transfer to extension from SIP trunk fails
« on: September 27, 2016, 02:38:47 PM »
Equipment: Mitel 5000 (software version unknown at this time.)
Scenario:
Internal extension (A) calls another internal extension (B) that points to a SIP trunk.
Call is answered by application on SIP trunk. Call is established and audio works fine.
During the call, the caller is transferred to another internal extension (C) via SIP in-call REFER method.
Problem:
The caller hears ringing, however the phone at the destination (C) does not ring.
Analysis:
Reviewing SIP trace of application on SIP trunk, the REFER is 202 Accepted and then a NOTIFY is received with body SIP/2.0 200 OK. After the NOTIFY, the application sends BYE to end the call (PBX should now have it as a blind transfer).
Testing:
Mimiced this call flow using three desk phones (i.e. removing the sip trunk from the scenario) by using one extension (A) to call another extension (Y) which then transfers the call to the destination extension (C) and it rings for both the caller and the destination phone. So it must be related to the SIP trunk somehow.
Not sure what the problem might be.
Thank you for suggestions on what to look at.
- Brian
Scenario:
Internal extension (A) calls another internal extension (B) that points to a SIP trunk.
Call is answered by application on SIP trunk. Call is established and audio works fine.
During the call, the caller is transferred to another internal extension (C) via SIP in-call REFER method.
Problem:
The caller hears ringing, however the phone at the destination (C) does not ring.
Analysis:
Reviewing SIP trace of application on SIP trunk, the REFER is 202 Accepted and then a NOTIFY is received with body SIP/2.0 200 OK. After the NOTIFY, the application sends BYE to end the call (PBX should now have it as a blind transfer).
Testing:
Mimiced this call flow using three desk phones (i.e. removing the sip trunk from the scenario) by using one extension (A) to call another extension (Y) which then transfers the call to the destination extension (C) and it rings for both the caller and the destination phone. So it must be related to the SIP trunk somehow.
Not sure what the problem might be.
Thank you for suggestions on what to look at.
- Brian