[cisco-voip] Faxing over CUBE SIP Trunks

[Pete Brown]

XMedius...

[cid:image001.png at 01D766E3.8B38BE00]

I still remember our CIO screaming at them on a call (veins popping and all) after our implementation.  Some poor fella had to fly in from Canada the next day to smooth things over.

Definitely second the 9600 baud part.  Solved a few problems for us.


From: cisco-voip cisco-voip-bounces at puck.nether.net<mailto:cisco-voip-bounces at puck.nether.net> On Behalf Of Kent Roberts
Sent: Monday, June 21, 2021 6:31 PM
To: JASON BURWELL <JASON.BURWELL at foundersfcu.com>
Cc: cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] Faxing over CUBE SIP Trunks

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<mailto: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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