01-19-2009 03:48 AM - edited 03-15-2019 03:36 PM
Hi all.
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
pass-through.
⢠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.
Regards
Dean.
01-19-2009 04:27 AM
Try using modem passthrough. You may find it to be more reliable than modem relay. Generally, I only configure modem relay if there is a very specific requirement to do so.
voice service voip
modem passthrough nse codec g711ulaw
fax protocol none
hth,
nick
01-19-2009 05:46 AM
thanks for the advice nick. I will try this and update.
Dean.
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