[cisco-voip] FAX relay vs. FAX passthrough

[Ahmed Elnagar]

this is a sample dial-peer that I used to relay faxes from PSTN to a FAX server thorugh an H323 gateway
 
dial-peer voice 345 voip
 description Test_Fax
 destination-pattern 345
 session protocol sipv2
 session target ipv4:x.x.x.x
 fax-relay ecm disable
 dtmf-relay rtp-nte
 codec g711ulaw
 fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback cisco
 no vad
 
here are some of my notes:
 
*Regarding CM 4.x fax relay with T.38 protocol is supported in H323 mode only no T.38 with sip is supported (that is why I made the dial-peer on the gateway as my FAX server only supports T.38 with SIP)
 
*Remember ro disable the ecm function under the dial-peer (the highlighted command) because this function sometimes makes problems with transmission of the fax.
*I didnot try using G.729 codec but it works fine with G.711 codec with me.
 
A very useful command for debugging is debug voice call fax it will be very helpful with you (and I think it is the only debug command available for FAX debugguing)
 
 
Thanks and Best Regards

Ahmed A. Elnagar
Network Field Engineer
 
Advanced Computer Technology (ACT)
16 Fawzy Ramah St.Off Shehab St.Mohandessin, Giza, Egypt 
Postal Code:12411 Cairo Egypt

Mob: +2010-2833868
Website: www.act-eg.com
E-mail: aelnagar at act-eg.com

________________________________

From: cisco-voip-bounces at puck.nether.net on behalf of Paul Choi
Sent: Mon 07-May-07 5:29 PM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] FAX relay vs. FAX passthrough



I'm soliciting for opinions on using FAX relay as
opposed to FAX passthrough.

We're using G.729 for FAX on a sizable cluster and
would like to get FAX to work using this codec. I know
that passthrough requires G.711 to work so I'd like to
hear on any opinions for anyone that has successfully
configured relay.

I'm changing the changing the protocol to Cisco FAX
under voice service voip configuration mode. I'm not
looking forward to configuring several VG248s for FAX
relay either but I'll do whatever it takes.

Paul



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