[cisco-voip] SCCP/SDL trace question re:transfer

[Ed Leatherman]

Hello!

I'm trying to help chase down a intermittent issue where Unity needs to
transfer a caller off-site to an answering service, and sometimes the
transfer doesn't complete and the caller gets left on-hold. I was hoping
someone could explain a message i'm seeing in the traces during a failure.

SCCP integration to unity connection. 9.1 software versions on both CUCM
and Unity. MGCP to PRI gateways. All gateways are set to offnet and service
parameter is configured to allow transfers between offnet to rule that out
as a issue.

On the trace side of things, for the transfer leg on a failure I see:
19:55:27.146 : Unity "presses transfer" , dials out the digits
19:55:29.853 : Q931 IN from PSTN for the transfer leg,  PROGRESS message
19:55:29.855 : CUCM OUT to Unity: Call State Ring out
*19:55:41.020 : CUCM OUT to Unity: DisplayNotify timeOutValue=15
notify='Cannot Complete Transfer' content='Cannot Complete Transfer' ver=12*

It looks like an abnormal amount of time for the call to connect, is that a
possible reason for the "Cannot Complete Transfer" message? Is the timeout
tweakable someplace?

On successful tries, the transfer leg connects faster (less than 10
seconds). So far we haven't found anything else different on our own; have
a TAC case open on it but getting shuffled between groups now (unity team
wants CUCM team to look at it).

Unity never seems to retrieve the caller from hold or try again, eventually
the caller hangs up (I see the the DISCONNECT message from PSTN) at which
point that call leg gets torn down.

Any ideas much appreciated

Ed
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