[cisco-voip] MGCP FAX Blues

[Erick Bergquist]

Mark,

Tried ECM bit already; will try to get remote customer
to do it.

On attenuation, will try adjusting the input/output
levels. I was under impression from previous TAC
dealings that when MODEM PASSTHROUGH/FAX methods were
used these settings were ignored and not in use. 

Thanks for the ideas. The DSL Filter one is
interesting. Maybe it filters out any noises being
passed through FXS port on router. Hmm. Umm.

--- Mark Blackford <Mark.Blackford at cbeyond.net> wrote:
> Yes - Super G3 is the bane of my existence right
> now.
> 
> T.38 Fax Relay is not implemented during a super G3
> connection as these
> is not any silence period.  The whole transmission
> is full duplex at the
> 33.6kbps modem speed so you never switch to a fax
> mode.
> 
> Try some of these things on the machine and its FXS
> port:
> 
> 1) Turn off ECM (some machines this will turn off
> SuperG3)
> -> On HPs, force it to use V.17 via advanced options
> 
> 2) Attenuation (seems to help with energy
> collisions)
> -> My favorite is:
> Input gain -6
> Output atten 14
> 
> 3) DSL Filter (can't figure this one out but
> sometimes it works)
> 
> 4) Use a 12.3 based code on a 24xx/26xx 
> 
> I hear Cisco is beta testing SuperG3 fax relay so
> maybe that will save
> us.
> 
> 
> -----Original Message-----
> From: cisco-voip-bounces at puck.nether.net
> [mailto:cisco-voip-bounces at puck.nether.net] On
> Behalf Of Jon Carnes
> Sent: Tuesday, March 22, 2005 4:50 AM
> To: erickbe at yahoo.com
> Cc: cisco-voip at puck.nether.net
> Subject: Re: [cisco-voip] MGCP FAX Blues
> 
> It's an interesting problem - isn't it?
> 
> We've battled this for years now, and the only
> correlation we can find
> is that the problem faxes (the ones you have trouble
> sending to) seem to
> use the Super G3 standard for faxing.
> 
> As another person mentioned yesterday, see if the
> folks having problems
> on the receiving side can set their fax machine to
> it's lowest speed
> (and not on Auto-detect). In the past that has
> worked for us, but Good
> Luck getting folks to do it! 
> 
> As a standard, we now run analog lines out to folks
> for their Fax use.
> We still have a handful of clients using ATA's for
> their faxing, but in
> general those folks don't do a lot of faxing (or
> they fax to the same
> numbers all the time).
> 
> Jon Carnes
> FeatureTel
> 
> On Mon, 2005-03-21 at 22:17, Erick Bergquist wrote:
> > Hi,
> > 
> > I have been trying to fix a FAX issue for the past
> 1-2
> > weeks. We have a 2611XM MGCP Gateway with a ISDN
> PRI
> > and CCM 3.3(4)sr2. We have FAX machines off a
> VG224
> > MGCP gateway. Most fax's are working fine, but we
> can
> > not make outbound FAX's to certain numbers. We
> have
> > had these numbers looked at by the telco and
> involved
> > carriers and no problems being found. FAX's always
> > fail to these FAX machines. 
> > 
> > If we put FAX machine on a analog POTS line (not
> VoIP)
> > it works. If e take FAX machine to another office
> > (company) next door who has their own seperate
> AVVID
> > install w/seperate equipment and PRIs the same FAX
> > machine can call the problem numbers without
> issue.
> > 
> > Anyone have any ideas on how to fix this? We have
> > tried FAX RELAY, FAX PASSTHROUGH, MODEM
> PASSTHROUGH,
> > etc. 
> > 
> > Thanks
> > 
> > 
> > 
> > 		
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