Velocity Reviews - Computer Hardware Reviews

Velocity Reviews > Newsgroups > Computing > VOIP > fax relay over IP - G.711, T.38

Thread Tools

fax relay over IP - G.711, T.38

Sani Rus
Posts: n/a
Hello group!

I wish to exchange experiences with someone who managed to successfully and
reliably set up the fax relay over the IP - either running G.711 or T.38 on
the IP side. Of special interest for me are the configurable parameters
which influences the reliability of the transmission - both parameters on
the gateways and on the faxes.

Network topology is as follows:

analog fax A - access GW - IP network - trunking GW - TDM network - trunking
GW - IP network - access GW - analog fax B

Does it make sense to run T.38 in such configuration (4 GW conversion
involved)? Is T.38 more suitable for 2 GW conversion only?

In general - how do standard analog faxes (e.g. Cannon, Brother, Panasonic)
or analog fax modems (e.g. US Robotics, Zyxel) perform in an IP network? Can
we configure them in any way to make them aware of the IP network? Any
comment or experience is more than welcome.

Best regards,


rus(no spam)

ommit (no spam) from e-mail address

Reply With Quote
Posts: n/a
I'm using a VoIP provider that runs a G.711 codec by default. I can't
tell you
what their network backbone uses, for certain, other than to say I know
its an IP
backhaul from the Sipura SPA-2100 in my house to their IP POP.

Our fax machine is a 1994 era Brother. The fax transmission looks
"clean" on the
receiving side, but we believe we have seen a packet drop.

The status indication on our fax machine indicates "line condition
problems", and when
we hear the modem interaction there appears to be a bunch of white
noise on the line,
upon fax transmission initiation.

We could use "overseas mode" on that old fax machine should we
encounter problems.

Reply With Quote

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
VOIP over VPN over TCP over WAP over 3G Theo Markettos UK VOIP 2 02-14-2008 03:27 PM
Free internet fax service, Fax online, Fax, Email fax Computer Information 0 01-02-2008 09:21 AM
free fax service, Fax online, Fax, Email fax george Computer Information 0 12-26-2007 03:35 PM
Dhcp Relay Agent And Acl On Sw 3750, DHCP Relay Agent and ACL on Sw 3750 Vimokh Cisco 3 09-06-2006 02:16 AM
Cheap t37 fax machine (Fax over IP) Greg Alexander VOIP 2 06-15-2005 02:28 AM