I have a pjsip trunk configured with the maximum channels set to 4. When I’m on a call (using that trunk) and try to place another call (also on that trunk) I get a fast busy. What can I check in settings or where can I look for help in troubleshooting. I’m guessing there are logs somewhere that have details when the call fails.
Who is the VOIP provider and do they support multiple calls on their trunk? Some providers also allow you to set the maximum number of channels on the provider portal.
Fast busy usually indicates “all circuits busy” or a wave-off due to a bad number or route.
You’d need to use something like sngrep to see the SIP conversations between the PBX and your provider.
Thanks Kenn. Provider is Telasip. According to them, I can have up to two simultaneous calls. It sounds like you suggest starting with them to verify, correct?
Yes. Make sure it is set up correctly on their end. Remember that if you have “Follow Me” on or some call forwarding to the outside to something like a cell phone, the second call going out would be using the second channel, leaving no available channel.
If the vendor says it is set up correctly, Google how to use SNGREP on your system so you can see the SIP dialogs and further analyze the situation.
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