Issue on a Switchvox pbx

Asterisk Asterisk Distributions
1

I have a Switchvox PBX. Most phones in this system work without issue. In this network, there is no NAT between PBX and phones. There is a NAT between PBX and Flowroute, but I don’t believe that is the issue here. The symptom is that some of these phones attempt to call a phone number (10 digit dialling) and the call will result in fast busy. Immediately, they hang up and try again and call goes through. Here is a capture of the bad call:

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Response:
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The call (when it goes through) looks like all other SIP calls do. I am at a loss here for how to troubleshoot this.

2

What you’ve provided is a normal start of a call, well an attempt, from a phone. The INVITE came in and we challenged it for authentication. It is then up to the phone to re-send the INVITE with credentials.

3

Sorry. Thanks for making me look again (I like the learning curve…). Here is the last packet in this bad call. caller hears “fast busy”

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4

And here is the next call (continuation after the 401 message). This is the one that works. I can provide more if needed

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5

That doesn’t really include any additional information.

6

Since it is the responsibility of the phone, though, to do the call again with INVITE it could very well be the phone in some capacity - a bug that has since been resolved. Not really anything else I can add.

7

Thanks. I’ll look at the phone firmware to see if that may be the cause.

8

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