We have a Mitel ICP 3300 at Head Office. All handsets are 5330.
Branch Office #1 has a Site-to-Site VPN to Head Office
Branch Office #2 has a Site-to-Site VPN to Head Office.
The issue I am having, is if a user from Branch #1 calls a user at Branch #2 the phone will ring, when they pickup it is dead air. This is the same in both directions.
Here is what I'm wondering. Does the Handset in Branch #1 talk directly to the handset in Branch #2 or does everything pass through the ICP? Both Branches DO NOT have a route to each other, just to the subnet at Head Office.
I thought I read somewhere that when you make a call the ICP initiates then hands off the communication directly between the handsets. Which would explain the problem.
Anyone able to confirm my thoughts or offer some insight?