Gamm SIP and Faxes

[Avalon100]

We are currently having an issue where Fax calls will not work since we changed to Gamma SIP trunks. I have tried various setting T38, T38 fallback, G711 etc but still cant get it to accept or make fax calls. I have passed to Gamma but has anyone else had issues?

Thanks

 

[amriddle01]

You need a fax machine that you can wind right down to 9600 baud rate and then you'll need a very decent low latency connection, then you stand a fighting chance but it's rarely 100%

 

[ipohead]

I don't know why but Fax Transport Support: None seems to work here.

I don't think I can set the speed of the fax or tell the actual speed used.

 

[derfloh]

Sounds strange but we have to do the same when connecting fax servers with SIP/H323 or if faxes want to fax over SCN onto ISDN lines.