I am having a great deal of trouble with IP Phones on our system.

After a recent major network change I needed to move the phone system from one network to another. I changed the system IP, MGI card IP via the installation tool software and then the SVMi via a hyperterminal console session. I then physically connected the phone system to the new network and re-set each IP phone with the new server IP address, subnet mask etc. Each IP phone connects to the server and each is correctly identified by the system. However, if someone uses these phones to call another digital phone, they can hear who answers but cannot be heard. If they call another IP phone then they work perfectly. Outside calls behave as digital phones.

i have tried just about everything I can think of. Any ideas?

The system type is 7200, software version 07.10.31 V4.14. The IP phones are ITP-5114D

Thanks

Mark