I have ATAs setup with other providers behind Sonicwall Firewalls without issue, so this has me stumped about how to make it work.
I was on the phone with Skyetel support for a couple of hours, and they were not much help. They said the Sonicwall is not configured right, which I already new was a possibility.
The ATA will not register to Skyetel when behind the Sonicwall.
I think it comes down to this:
The ATA's outgoing port is something in the 13k+ range and it goes to port 5060 at Skyetel. It appears Skyetel answers back to the ATA on 5060, even though it sees the traffic coming in on the high port. Of course, there's no path back to the ATA on 5060, it's on the higher port.
Since Skyetel only answers on 5060, I think I need to force my ATA to send the registration request out on 5060, but I can see how to do that.
I think my options are ATA goes out on 5060, or the Sonicwall NATs it to be so.
The same ATA and same (unchanged) Sonicwall work just fine to other sip providers.
Any thoughts or ideas for me to try?
Thanks.
attn: @JaredBusch