1.5 Administrator's Guide

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  3. 1.5 Administrator’s Guide
  4. Commissioning the unit
  5. Configuring Comma device ports
  6. Configuring devices for Fax / modem support
  7. Fax Over IP

Fax Over IP

om.X systems support t.38 faxing and g711 bypass on SIP trunks. With G.711 bypass, the trunk is configured for a compressed codec (e.g. G.729) as well as G.711 A-law. The upstream gateway re-invites on detecting the fax tone, excluding the G.729 from the allowed codecs. The Com.X switches to the A-law codec, allowing clear channel fax transmission.