asterisk users - Jan 2006 - Transfer issue with a Cisco CCM/phone

Hello,

We have a mixed environment here consisting of a number of Avaya PBX
systems, a group of Cisco Call Managers, an H.323 gateway on a Cisco
router, and an Asterisk server.  The PBX land is connected to the VoIP
land using the Cisco router/H.323 gateway.

The Asterisk system is running code from the CVS tree from around mid
Oct 2005.    The OH323 driver on the system is from inaccessnetworks,
version 0.7.3.

We are having an issue transferring calls from one system to another.  

When the transfer is attempted on various sets, it does not work and the
call is 'lost'.   When the called party is on a cisco phone, the Avaya
(calling party) hears music on hold from the cisco system while the
transfer is being made.  The Cisco user reaches the auto-attendant on
the Asterisk box and the music on hold is heard by the Avaya caller.
When the Cisco user attempts to complete the transfer by pressing the
transfer button again, the music goes away on the Avaya phone but the
call remains on the Cisco phone and the transfer button remains active
on the cisco set and does not transfer the call.

Additional examples: 

THESE DO NOT WORK...

* Avaya user calls a Cisco user and talks. The called party (Cisco user)
then attempts to transfer to an auto-attendant on the Asterisk system.
The call does not transfer.

* Cisco user calls another Cisco user and talks.  The called party then
attempts to transfer to an auto-attendant on the Asterisk system. The
call does not transfer.

* Outside user calls number which passes through Avaya PBX and Cisco
router to the Auto attendant.  The user then dials an extension to a
Cisco phone.  The called party on the Cisco phone can not transfer a
call.

THESE WORK...

* Avaya user calls another Avaya user and talks.  The called party then
attempts to transfers to an auto-attendant on the Asterisk system.  The
call DOES TRANSFER.

* Cisco user calls an Avaya user and talks.  The called party (Avaya)
then attempts to transfer to an auto-attendant on the Asterisk system.
The call DOES TRANSFER.

* Outside user calls number which passes through Avaya PBX and Cisco
router to the Auto attendant.  The user then dials an extension to an
Avaya phone.  THE CALLED PARTY CAN TRANSFER THE CALL.

Any assistance in solving this issue would be appreciated.
cpeckham@mercy.edu