asterisk users - Nov 2004 - Transfer # - Intermittent with Cisco 7905 SIP Phone

We are having some problems with our Cisco 7905 phones (SIP 7.x) and the
transfer "#" functionality not working intermittently.  Has anyone
else
experienced this?  

Problem Description:  User dials "#" to transfer a call to another SIP
extension.   Both the user and the party on the other end hear a dial tone
when "#" is dialed but Asterisk does not prompt for extension to
transfer
to.  Intermittent problem, most of the time dialing "#" to transfer
works
fine.

Regards,

J. Staalenburg
Teksavers, Inc.