Just changed router to a BT business hub5 and therefore needed to use SPA 112 adapter to use a voip telephone line for a brother all in one fax machine. The fax machine can dial out and send faxes but cannot receive. Does anyone know what adjustments need to be made on the cisco adapter, fax machine or router?
One thing you may have to do to receive faxes is lower the baud rate/speed in the fax settings and/or disable ECM (Error Correction Mode).
A lot of newer faxes are set to send/receive at 33.6k, but that speed generally will tend to fail over VOIP. It's generally recommended to lower it to 14.4k or lower. I set mine to 9600. And ECM will cause faxes to fail if too many packets drop, so you can see why that might be problematic. Here's a reference -
You have a Cisco Unified Communications Manager (CUCM) system and want
to configure a SPA112 analog telephone adaptor (ATA) to register to the
CUCM so that you can use up to two analog phones or similar FXS devices
with the CUCM.In this application note, ...
This document is a must-read for all SPA232D installers, administrators,
and users. The document takes you from unboxing the SPA232D ATA and
SPA302D DECT handsets, through DECT handset registration, and connecting
to the PSTN and ITSP.The document describ...