Customizing sip response codes for PBX Sip trunk

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Asterisk Users 1 Comment

Say the PBX is:
Mitel-3300-ICP 10.2.0.26_2
Created SIP trunk to * but PBX doesn’t see trunk as unavailable when
its really unavailable. It simply fails the calls..
How can I change the SIP response code to respond with e.g. “All Channels busy”?
Any suggestions on how to program the Mitel to work?
Tx Shaun

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