[cisco-voip] Fax and Modem Parameters ?
svoll.voip at gmail.com
Wed Feb 18 11:11:04 EST 2009
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
Like Ed said, check to make sure your clocking is correct. That's enough to
kill any fax.
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,
> 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
> cisco-voip mailing list
> cisco-voip at puck.nether.net
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