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Old 04-05-2009, 04:35 PM   #1 (permalink)
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Default UMA keeps dropping

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I have some phones that keep dropping UMA. I determined that the association with the AP is not an issue. The APs don't have firewalls, this model was not designed for that purpose at all. I'm thinking there is a problem at the actual firewall though. All inbound traffic is set to deny. Outbound gets out, reponses to those connections get back in.

UMA will come up for a couple minutes only to drop to Edge or SOS. I do get ISP error in Wi-Fi diagnostics, sometimes I get UTC channel activation failed.

I've tried this with two 8900s and an 8320, all running the latest official release from T-Mobile.

Is there a problem with Sonicwall firewalls? What do I configure there? Do I need to ask the firewall admin to add explicit exceptions to UMA services for the VLAN the phones are on?
Old 08-22-2009, 05:04 PM   #2 (permalink)
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sorry for digging up an old post, but I'm new here and I didn't want to start a new thread, anyhoo...

I'm having the same issue with my network. We have a sonicwall firewall (pro 2040 + Sonicpoint AP) and UMA does not work there. The icon displays but if a call is placed it drops to EDGE. At home UMA works great; I have no issues.

Any help would be nice. I plan on getting sonicwall involved but thought I would first troubleshoot myself.


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