Fax and Cisco VGC248

Also here is a link from Cisco on the subject:

http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122newft/122t/122t11/ft_ghost.htm

Scratch the one above (this one is specific to your equipment)

http://www.cisco.com/en/US/products/hw/gatecont/ps2250/products_configuration_example09186a008020160d.shtml


Kindest reagrds,

Joel_Sisko

Jim,

Any luck ?

Joel_Sisko

Joe,

I made the changes indicated in your third comment (http://www.cisco.com/en/US/products/hw/gatecont/ps2250/products_configuration_example09186a008020160d.shtml)

But, I am seeing the same results. It is interesting to note that ALL of the sites that have problems are all using old fax machines.

Jim,VoIP

Since that ALL was emphasized, do you happen to have a fax machine that is known to work on the netwwork? There could be a problem that the older machines are using an older standard which the Gateway is not detecting the fax tones correctly. Also if forklifting the fax machines out are not a vialable option a work around could be building a seperate VoIP dail peer that is accessed by lets say the number "8", then we can just enable that VoIP peer to always excpect faxes diabling any compression and such.

Aslo can you post the config of the 248 and a remote site gateway that is having the problem.


Joel

I wasn't clear. All of our internal fax machines work 99% of the time to both internal and external sites. The only problem we encounter is when we fax to 5 or 6 external sites. Those sites all seem to have older fax machines, and none of the machines are under our control. The problem faxing to those machines is reproducible from any fax machine in our network.

I have just had a user give me a bit of additional info. Her HP fax retuns a "low signal level" message when she faxes to one of the problem sites. I tried monkeying with the line levels to no avail.

I recently heard of another site in our area that switched to a Cisco VOIP solution and they ended up putting all of their faxes on CentraNet lines. That seems like fixing the symtom and not the problem. I can't believe that a problem like this is unique to us, so I am going to figure it out one way or another.  

So to paraphrase, faxing works across VoIP network, just few end clients have machines that are not working. Quick question do you know if you clients have problem with anyone elese? Also are the clients being served from the same central office?

Moving to Centranet, one question, do you know if the service is being delivered via T1? That could explain why the problem seemed to be fixed.

Can you call HP and find out what "low siganl level" means from thier point of view?

You said you adjusted line levels? How did you do this? Essentially you want to adjust eh dB gain of the lines to do this. Also what type of connections to the PSTN do you have for the Voice? Analog or Digital?

Joel_Sisko