I have a customer runnig cucm 7.1.5 ,
my customr have a vg224 that configured as sccp gw in the cucm and a 2811
router that connect to the pstn via e1 pri, the 2811 is configured as mgcp gw in the cucm .
my problem is that is some cases we are not able to receive a fax call ,
and int same cases the fax are ifne ,
most of the failed faxes are comming from a fax software at the remote sides .like winfax and etc .
the vg224 and the 2811 router are configured as fax pass-through
can u try to help me ?
This is a known issue with FoIP. You can get this to work by setting configuration at three locations, CallManager, VG224, and your 2800 gateway:
In CallManager VG224 "Product Specific Configuration Layout:
Modem Passthrough - Enable
Cisco Fax Relay - Disable
T38 Fax Relay - Enable
On Voice Gateway Router:
voice service voip
fax protocol t38 version 0 ls-redundancy 2 hs-redundancy 0 fallback none
no ccm-manager fax protocol cisco
mgcp call-agent 10.68.192.10 2427 service-type mgcp version 0.1
mgcp dtmf-relay voip codec all mode out-of-band
mgcp rtp unreachable timeout 1000 action notify
mgcp modem passthrough voip mode nse
mgcp package-capability rtp-package
mgcp package-capability sst-package
mgcp default-package fxr-package
no mgcp package-capability res-package
no mgcp timer receive-rtcp
mgcp sdp simple
mgcp fax rate 14400
mgcp rtp payload-type g726r16 static
Hope that fixes it for you.
I am sorry, but what is a known issue?
You cannot just slap faxes on the network and hope it will work by default, you need to plan what fax protocol you will use and configure it accordingly as different devices have different capabilities, and some faxing protocols are only supported on certain VoIP protocols, i.e. protocol-based T.38 does not work with SCCP, etc.
You can do fax passtrhough, modem passthrough, fax realy, NSE T.38, protocol-based T.38, which one are you using?