We have a Cisco 2851 registering as an h323 gatway with a pri connected to a Nortel option 11 using qsig.
The router is registered to a Nortel linux based NRS at release 5.5.
The other side of the connection is a Nortel CS1000E on 5.5 code.
Router is successfully registered and calls can complete correctly. However, if the call is placed on hold an then taken off of hold there is no audio path.