[cisco-voip] Faxing over CUBE SIP Trunks

[Kent Roberts]

sure.   This is what we had to do to get fax working for use on both vg’s. (202/322/fxs) and Rightfax/brook trout cards) 
Rightfax has the g711 failback enabled.   IE it controls it not the cube.


Under voip service voip..

Fax protocol t38 version 0 ls-redundancy 0 hs-redundancy-fallback none

sip
Midcall-signaling passthru
header-passing

And the dial-peers towards the carriers:
fax-relay ecm disable
fax rate 14400



Good luck.  Fax is an easy but fun/tough thing to make right.         Put Wireshark on your server, it helps.     Also, ,might need to force the max fax rate to 9600.   


> On Jun 21, 2021, at 12:26 PM, JASON BURWELL via cisco-voip <cisco-voip at puck.nether.net> wrote:
> 
> Can anyone offer some guidance doing faxing over SIP Trunks? Ever since switching to CUBE SIP trunks I’ve been having challenges with outbound faxes. With one provider, it rarely works, the other it works most of the time but is not reliable. Sometime it fails and I resend it and works fine. I have an Xmedius Fax Server using T38 with G711 fallback. Feel like I am missing something, I’ve had a few cases open and a mix of fingerpointing (XMedius/Cisco/Provider) and dead ends but no solid resolution. Just figured I’d ask out here before I escalate these cases again. Both providers use G711 codec on the trunks. When I point the calls pack to MGCP PRI I have no issues.
>  
> Thanks
> Jason 
>  
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