I believe this is a tried and true topic, but I wanted to find out if there is an answer to it.
When I dial out via a SIP trunk and the called party is busy, I get silence. If I call the same number from a cell phone or an analog phone then I get either a busy or Forward on Busy to voice mail. I believe the SIP trunk is reacting this way because of the messaging (or lack there of coming back) from the carrier.
Is there a tip or trick that I can employ that will allow the SIP trunk to work the same way as the cell or analog phone? I did a quick search of this topic (in the forums) but didn’t come across anything definitive.
In "Settings -> Advanced Settings"
remove the “r” from Asterisk Outbound Trunk Dial Options
i.e. Ttr should be Tt or empty if you don’t want to allow transfers.
… this will remove fake ringback.
Then, if the problem persists - check your sip debug to make sure your provider is returning to you 486 Busy message.
Hello
I did some reading and changed the following value: Connectivity > Trunks > My SIP Trunk > Asterisk Trunk Dial Options > Override.
When I call an unreachable cell phone, instead of a long period of silence followed by a VM, I now get a much shorter period of silence followed by the VM.
Is this a recommended way of handling the “Busy Signal Via SIP Trunk”?
Thanks in advance for any suggestions or recommendations.