[cisco-voip] Fax Machine Blues

[Nick Marus]

Are you setup for fax relay or passthrough? With both, the connection
and audio registers on the ata need to be configured to match however
your gateway is setup for ralay or passthrough (as well as redundancy
if you are using that option). My opinion passthrough is the best.

I had a similar problem with the ata188's where I had a mismatch
between the gateway and the 188's for passthrough and relay. If the
ata is set one way and the gateway is another, the call will not go
out.

Check out the Cisco documentation site for Voice and look at the
Ata186/188 admin guide. Specificly in that doc look under the section
heading "Configuring and Debuging Fax Services". It has the
description of the config registers on the ata's and some quick things
to check on the gateway depending its setup (h323, mgcp, sip).


On Mon, 21 Mar 2005 19:42:48 -0500, Rusty Painter
<RPainter at dorchestercounty.net> wrote:
> 
> 
> We have just installed Cisco VoIP.  Running CCM 4.0(2a)sr1a.  The system has
> been running in production for about 2 weeks now.  The phones seem to be
> working well (7905,7912, and 7960s).  We are, however having problems with
> fax machines.  People are able to fax to any internal extension.  When they
> try to fax out of the system, sometimes they can, and sometimes they get a
> fast busy signal.  When you dial that same number from a phone, a fax picks
> up.  Later on, they may be able to fax.  This is happening on both ATA186s
> and VG224s (mostly on the ATAs).  I was told by my vendor, BellSouth, that
> the ATAs have a problem with fax machines on port 2.  I moved all faxs to
> port 1.  Still have the problem.  Has anyone else experienced this?  If so,
> what did you do to resolve it?  Thanks. 
> 
>  
> 
> Rusty Painter
> 
> MCP/CCNA/Net+/A+
> 
> Microcomputer Technician
> 
> Dorchester County ITS
> 
> 201 Johnston St.
> 
> St. George, SC 29477
> 
> Tel:           (843) 563-0022
> 
> Fax:          (843) 563-0033
> 
> E-mail:      rpainter at dorchestercounty.net
> 
>  
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-- 
Nick Marus
nmarus at gmail.com