[cisco-voip] SIP trunk fax troubleshooting

[Lelio Fulgenzi]

I recall being at a Live session whereby they said just that, if you're still doing FAXing without some sort of FAX server, keep using a PRI for that. By "they", I mean David Hanes, Gonzalo Salgueiro, the writers of the Modem/FAX book who were doing the session. Or at least I'm pretty sure about that anyways. 

It's one of the (many) reasons I've steered away from SIP for now . 

--- 
Lelio Fulgenzi, B.A. 
Senior Analyst (CCS) * University of Guelph * Guelph, Ontario N1G 2W1 
(519) 824-4120 x56354 (519) 767-1060 FAX (ANNU) 
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ 
Cooking with unix is easy. You just sed it and forget it. 
- LFJ (with apologies to Mr. Popeil) 


----- Original Message -----
From: "Robert Kulagowski" <rkulagow at gmail.com> 
To: "Cisco VOIP" <cisco-voip at puck.nether.net> 
Sent: Monday, July 30, 2012 12:43:18 PM 
Subject: [cisco-voip] SIP trunk fax troubleshooting 

Outbound faxes aren't working. 

Fax machine is connected to a VGC -> CUCM -> SIP trunk -> CUBE -> bandwidth.com 

Cisco IOS Software, C2900 Software (C2900-UNIVERSALK9-M), Version 
15.1(4)M2, RELEASE SOFTWARE (fc1) 
Technical Support: http://www.cisco.com/techsupport 
Copyright (c) 1986-2011 by Cisco Systems, Inc. 
Compiled Mon 26-Sep-11 17:37 by prod_rel_team 

ROM: System Bootstrap, Version 15.0(1r)M12, RELEASE SOFTWARE (fc1) 

voice service voip 
ip address trusted list 
ipv4 216.82.224.202 
ipv4 216.82.225.202 
ipv4 10.255.23.7 
ipv4 10.255.1.21 
ipv4 10.255.29.20 
address-hiding 
mode border-element 
allow-connections sip to sip 
no supplementary-service sip moved-temporarily 
no supplementary-service sip refer 
fax protocol pass-through g711ulaw 
sip 
header-passing 
error-passthru 
no update-callerid 
early-offer forced 
midcall-signaling passthru 
privacy-policy passthru 
g729 annexb-all 

dial-peer voice 10000 voip 
description Outbound SIP to Bandwidth.com 
translation-profile outgoing SIP-OUT 
destination-pattern 8T 
session protocol sipv2 
session target ipv4:216.82.224.202 
voice-class sip dtmf-relay force rtp-nte 
dtmf-relay rtp-nte 
codec g711ulaw 
fax-relay ecm disable 
ip qos dscp cs5 media 
ip qos dscp cs4 signaling 
clid restrict 
no vad 

The CUBE book makes it seem like it should "just work". 

I've also tried: 

dial-peer voice 10000 voip 
description Outbound SIP to Bandwidth.com 
translation-profile outgoing SIP-OUT 
preference 1 
destination-pattern 8T 
session protocol sipv2 
session target ipv4:216.82.224.202 
voice-class sip dtmf-relay force rtp-nte 
dtmf-relay rtp-nte 
codec g711ulaw 
fax-relay ecm disable 
fax rate 9600 
fax protocol pass-through g711ulaw 
ip qos dscp cs5 media 
ip qos dscp cs4 signaling 
clid restrict 
no vad 

No joy there either. 

Seems like fax and modem are perpetual issues with SIP trunking from 
what I can see in the archives? The easiest would be to just continue 
to send fax to PRI / analogs, but where's the fun in that? 
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