[cisco-voip] Fax and Modem Parameters ?

[Scott Voll]

Dane--

Is the CMM blade setup as H323 or MGCP?  I would make sure either way that
you make sure fax relay is turned off.  I believe on the CMM blade in MGCP
mode it is set to relay by default.  Killed our faxes until I finally found
that.

Like Ed said, check to make sure your clocking is correct.  That's enough to
kill any fax.

Scott

On Wed, Feb 18, 2009 at 7:07 AM, Ed Leatherman <ealeatherman at gmail.com>wrote:

> FWIW, Here is how we program our VG248 fax ports when we run into
> issues.. have had fairly good success:
>
> global telephony settings:
> Passthrough Signaling : IOS Mode
> Passthrough Codec: G.711 u-law
>
> Port specific settings:
> Call Control mode = Basic
> Caller ID = Disabled
> MWI Method = none
> Fax Relay = Disabled
>
> CCM Admin port settings, basically make sure to match the port config on
> the VG.
> Call Control Mode = Basic
> Caller ID = Disabled
> MWI = none
> Fax Relay = disabled
>
> We don't have any CMM blades, only thing I can comment on is make sure
> clocking is correctly configured for your T1 ports, clock slip errors
> kill faxes. Could be issue on the network too, one time we had a PIX
> that was delaying packets every 20 seconds, basically killed any fax
> traffic going thru it. Took us an embarrassing amount of time to track
> it down (with help from TAC).
>
> Pass-through is definitely what you want to use assuming the call is G.711.
>
> Hope that helps,
> Ed
>
> On Wed, Feb 18, 2009 at 9:27 AM, Dane <dane at pktloss.net> wrote:
> >
> > I have been getting reports of faxing issues since we moved to some
> > new circuits.  Faxes are connected to VG248s, new circuits are
> > connected to WS-SVC-CMM-6T1 and old circuits were connected to same
> > 6509 but the port was on a 6608.
> >
> > I noticed that on the 6608 ports you have the section for "Fax and
> > Modem Parameters" however on the CMM-6T1 the ports don't have anything
> > related to faxing in there.
> >
> > On the CMM-6T1 module config there is one item related to Fax mode
> > that can be either Fax Passthrough or Fax Relay.  Currently Fax
> > Passthrough is selected.
> >
> > The fax machines are giving an error "poor line condition" or "busy no
> > response", however there is really no consistency in the user reported
> > errors.  Sometimes it works, sometimes it doesn't.  Different numbers
> > being called, different fax machines reporting the issues.  I do know
> > that this was not an issue prior to moving the circuits, so my guess
> > is its the new circuits or simply related to the fact I am using these
> > CMM-6T1's now as opposed to the 6608.
> >
> > I read about making sure the ECM was off on the fax machines and that
> > speed was set to 9600.
> >
> > Other than that anyone have any thoughts or suggestions on
> troubleshooting this?
> >
> > Thanks
>
>
> --
> Ed Leatherman
> Assistant Director, Voice Services
> West Virginia University
> Telecommunications and Network Operations
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> cisco-voip at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-voip
>
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