Call transfer from agent to ext phone(UCCE Setup)

[Rajesh Kalra]

Hi,

this is a Contact centre enterprise setup (CUCM 8.5) where there is CUCM,CVP,Voice Gateway and agent using CAD.

Caller calls the CVP IVR number, call gets routed to the free agent.
Call is taken by the agent. Agent now tries to transfer this call to an external number(say mobile phone) and initiates the call. The external mobile phone rings, the mobile phone recipient takes the call and the agent and mobile phone receipient can talk (the  call centre caller is on hold), but the moment the agent presses the transfer button to complete the transfer, the call drops.
The Call flow is PSTN -> Voice Gateway-> CVP(IVR)->SIP Trunk-> CUCM-> Agent -> transfer to external mobile number  .... issue when transfer is completed.

On the voice gateway while running the ISDN debug, I see the error message:

Cause i = 0x80AF - Resource unavailable, unspecified

which looks to me like a codec mismatch. I have checked the region configuration is o.k. on CUCM.

Question: Does this need transcoding?? I don't think so.

The issue is only when the agent presses the transfer button again to complete the transfer,as then the call drops.

However, for the following scenario, the case where call comes to IP Phone as DID from PSTN, and IP Phone call recepient wants to transfer this call to the recepient there is no issue.The Call flow is PSTN -> Voice Gateway-> CUCM-> IP Phone -> call transfer to ext mobile number... No issue

The issues is noted when UCCE is involved.

Any suggestions what and where is the problem and how this can be resolved.

Thanks

[Dass Prakash R]

Hi Rajesh,

Can you please provide the codecs involved in the above call flow component wise? Because, CCM will have in built transcoders whereas CVP will understand G711 codec

Thanks,

Dass

[Rajesh Kalra]

Hi,

I don't know why the call is disconnects as the the codec because CVP,SIP Trunk,Voicre Gateway, Cisco IP Phones(7942) all can support the same G711 codec.

any thoughts.

The region used by SIP Trunk(Voice Gateway & CVP) and IP Phones all use G711.

Thanks

[Ahmed Khalefa]

In the CVP path to the CUCM , i.e the CVP SIP Trunk , please check the Media Termination Point Required and make sure it is CHECKED .

and try again .

Thanks A lot,

Ahmed Salah