не работает транк, 3 аналогичных 1 из них не работает

`WARNING[835]: appdial.c:1518 dialexec_full: Unable to create channel of type 'SIP' (cause 20 - Unknown)

== Everyone is busy/congested at this time (1:0/0/1)

-- Executing [73235@dialout:26] NoOp("SIP/717-001848c5", "We have to recover real CallerID") in new stack

-- Executing [73235@dialout:27] Set("SIP/717-001848c5", "CALLERID(num)=717") in new stack

-- Executing [73235@dialout:28] Goto("SIP/717-001848c5", "s-CHANUNAVAIL,1") in new stack

-- Goto (dialout,s-CHANUNAVAIL,1)

-- Executing [s-CHANUNAVAIL@dialout:1] NoOp("SIP/717-001848c5", "Trying another trunk") in new stack

-- Executing [s-CHANUNAVAIL@dialout:2] Return("SIP/717-001848c5", "") in new stack

-- Executing [73235@dial-trunk13:2] Return("SIP/717-001848c5", "") in new stack

-- Executing [73235@internal-cos4:3] Hangup("SIP/717-001848c5", "") in new stack`

Входящие есть а вот исходящии вот эта бяка