FXS to FXS Call

[Anonymous]

Unfortunately there are calls to the outside from the FXS port as well as internal calls from FXS to FXS port.  It is a convuluted system where they send faxes to the outside world as well as sending faxes from different local FAX machines to an internal FAX server which then scans the documents and adds them to their document management system.  And the hairpining going on is causing issues on the local faxes.  For a work around we setup network scanning for them to bypass the issue.

John Wable

[jayh · Accepted solution]

Configuring a specific reject for the local fax numbers on the SIP grouped-trunk still won't cause a problem.

That will prevent calls to those specific numbers from leaving out the SIP trunk.  It won't affect incoming calls to those numbers from the SIP trunk.

Seeing as those phone numbers are local FXS users, there is no reason to send calls from the Adtran out the SIP trunk for them.  As you've discovered, they'll just hairpin back anyway.  So reject them specifically on the SIP trunk and they'll stay local.

[Anonymous]

Thanks that worked.  Reassigned your answer as correct.

John Wable