Possible trunk failover problem

General Help
1

I have just setup a SIP trunk to another office, where a small IP PABX is setup with a single FXO port so we can dial local calls from our main office to that location. The trunk works fine, although in my outbound route I have selected to use our local misdn trunk if that line is engaged. I get the following when I am already on one call and try to make another up the same trunk, hoping it will failover.

Executing [s@macro-dialout-trunk:23] Dial(“SIP/3099-08879448”, “SIP/bomsiptrunk/64583170|300|TW”) in new stack
– Called bomsiptrunk/64583170
– Got SIP response 486 “Busy Here” back from 192.168.4.21
– SIP/bomsiptrunk-0885c5f0 is busy
== Everyone is busy/congested at this time (1:1/0/0)
– Executing [s@macro-dialout-trunk:24] Goto(“SIP/3099-08879448”, “s-BUSY|1”) in new stack
– Goto (macro-dialout-trunk,s-BUSY,1)
– Executing [s-BUSY@macro-dialout-trunk:1] NoOp(“SIP/3099-08879448”, “Dial failed due to trunk reporting BUSY - giving up”) in new stack

After this my line hangs up and doesn’t try to dial my second preferred trunk.

Anybody have any ideas that I can try or look at to test further.

Cheers

2

Further to my last … it makes no difference if i select max channels or not in the Trunk config. I had it set to 1 originally as there is only one line available, but I changed it to nothing and the result is the same.

3

you trunk is reporting busy, the behavior is correct. Your trunk needs to report congestion of some sort in order to fail over. It’s equivalent to dialing a phone number and that number is busy, you don’t keep trying to dial that same phone number over and over out multiple trunks.