I have setup a vg224 using sccp and fax/modem relay. Although all of the fax machines, franking machines and most modems are working ok, we do have a problem with a few modems not working.
i believe the problem maybe to do with the following as stated on Cisco's website
Cisco modem relay works only if both modems are high-speed modems (V.34, V.90) that use V.42bis
bidirectional compression. For low-speed modems, gateways that carry traffic use modem
â¢ Cisco modem relay works only if both modems use the V.42 error correction protocol and if the error
correction layer in both modems is enabled.
If this is the case is my only course of action to either A) replace the modem with a compatible one or most likely B) change the VG from relay to pass through?
the modems that do not work do seem to be very old. The problem they are experiencing is that when we try to initiate the connection the dialup connection reports that it cannot detect the dial tone.
However if i connect my analogue phone there is dial tone and Im able to make a call.
can you help me on this?
i can supply config if this would help.