Asterisk Temporarily Unavailable

My asterisk connects to trunk it used to work.
but today it cannot call-out
message from sngrep

2022/12/06 13:20:49.420284 [trunk_IP]:5060 → [asterisk server ip]:5060
SIP/2.0 480 Temporarily Unavailable
Call-ID: 33149865-105f-4f79-9675-30f71f835891
CSeq: 13029 INVITE
From: “20042574” sip:20042574@trunk_IP;tag=9fe837d1-3d42-4938-a4ed-095a066f8d1e
To: <sip:[telephone number]@[asterisk server ip]>;tag=sip+3+4a440010+4ee847fe
Via: SIP/2.0/UDP [asterisk server ip]:5060;received=;rport=5060;branch=z9hG4bKPj2f82cd63-c29b-47c1-b1f0-31b6aaf951d8
Server: SIP/2.0
Content-Length: 0
Contact: sip:5c080894411db088fe929b750fb5b870@trunk_IP:5060;transport=udp
Reason: Q.850;cause=16;text=“normal call clearing”
Warning: 399 - “UAC3000 R001-ACU Rel POS:[253] Release from CCB PP[0x12c] CS[0x8] AS[0x5] FR[0x8] TR[0x9] TYPE[0x2]”

normal it can call out, today it waits until timeout of asterisk then stops calling

Logs? Version? Channel Drive in use? Dialplan? channel driver configuration?

Now, it’s resolved. this problem because trunk Conf.


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