[cisco-voip] [EXTERNAL] Re: Faxing over CUBE SIP Trunks

[JASON BURWELL]

Thanks Kent,

A couple follow up questions, if you don’t mind? You mentioned the fax server had G711 fallback enabled but you have it disabled on the CUBE? Does that not cause any G711 fallback attempt by the faxserver to fail?

Also, do you recommend setting the fax rate to 9600 on the CUBE or leave the CUBE 14400 and limit that on the fax server?

Thanks!
Jason

From: Kent Roberts <kent at fredf.org>
Sent: Monday, June 21, 2021 7:31 PM
To: JASON BURWELL <JASON.BURWELL at foundersfcu.com>
Cc: cisco-voip at puck.nether.net
Subject: [EXTERNAL] Re: [cisco-voip] Faxing over CUBE SIP Trunks

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________________________________
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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