[cisco-voip] fast busy when phone CFA via CUBE

[Erick Wellnitz]

I have an issue which is probably very easy to fix but I think I'm making
it more complex than I need to.

I have a Nortel that we are migrating to CUCM 9.1 from.  In the interim, we
have interated the two using SIP via CUBE.  PSTN gateway is H323.  I
wouldn't normally do this but decisions get made and we have to deal with
it.

Call from Nortel to IP Phone works fine.  Call forward that same IP Phone
to a PSTN number and the call connects to the external number as if nothing
was wrong but the Nortel phone gets dropped with a 'fast busy'.

Traces and TAC (626731957) that my colleague opened seem to show a codec
/capabilities mismatch but I can't find a codec mismatch in the system at
all and our reporting/monitoring tool shows the call trying to connect as
G711u on both sides.

Is this a situation where an MTP is gong to be necessary or is there a way
to avoid mandatory MTP?

Thanks in advance!
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