UPDATE: 3CX version 18 has discontinued Exchange voicemail support. The steps outlined in this article will enable 3CX v18 to work with Exchange UM voicemail!
Had an issue with an IP fax server (RelayFax with a Dialogic SR140 connecting via SIP trunk to an Adtran SBC) where inbound faxes were working fine
To perform a packet capture directly on an Adtran device do the following: ip access-list extended CAPTURE permit ip any host 1.2.3.4 permit ip host
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