we are on 6.0.8 but we are upgrading to 7.0 tomorrow. Im begining to think my sonicwall is blocking the ports. I created a route for the two but did not open any ports. not that familiar with sonicwall, so looking into that now. and I confurmed that they do not use stun today.
You want to be sure the latest firmware is on the Sonicwall. Sonicwall's had a problem with SIP for years. With SIP transformations turned on, you do not need to open any ports.
The latest TZ210 firmware is: 5.8.1.0.
In Sysmon do you see the SIP packets being sent and received (TX and RX)?
Are you using SIP Registration or IP Authentication?
Can you post some screen shots of your SIP config on the IPO? Use a site like imageshack or photobucket.
If you are not seeing any TX packets for SIP in SysMon, than your IPO is not attempting to register. Even if the Sonicwall was blocking all outbound traffic, your IPO would just keep trying to TX registration packets.
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