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Fax Relay and MGCP

VG200 was using H323 and fax relay for fax. Access to the PSTN was via a 2650xm H323 gateway with a PRI. Faxes worked fine in and out.

We have upgraded the VG200 to V12.2(13T1) and changed it to use MGCP fax relay and access to the PSTN is now a 2650XM MGCP gateway with PRI (also V12.2(13T1). Now outigoing faxes are sometimes failing - either don't send, fail after a page or sometimes send but bits are missing.

I'm sure the data path between the gateways is ok as they are on the same LAN. There are no errors on the ethernet ports of the gateways or the switch ports in between. E1 controller is also clean.

It must be a config issue. I'm sure I must be missing something. Can some-one check these out?

Here is the 2650XM PRI gateway config.....

!

isdn switch-type primary-net5

!

ccm-manager switchback immediate

ccm-manager redundant-host 10.90.0.6

ccm-manager mgcp

ccm-manager music-on-hold

ccm-manager config server 10.90.0.5

ccm-manager config

!

mta receive maximum-recipients 0

!

controller E1 1/0

pri-group timeslots 1-31 service mgcp

!

interface FastEthernet0/0

ip address 10.92.0.252 255.255.0.0

duplex auto

speed auto

!

interface Serial1/0:15

no ip address

no logging event link-status

isdn switch-type primary-net5

isdn incoming-voice voice

isdn bind-l3 ccm-manager

no cdp enable

!

call rsvp-sync

!

voice-port 1/0:15

cptone GB

!

mgcp

mgcp call-agent 10.90.0.5 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode cisco

mgcp rtp unreachable timeout 1000 action notify

mgcp package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp timer receive-rtcp

mgcp sdp simple

mgcp fax t38 inhibit

!

mgcp profile default

!

dial-peer voice 9991015 pots

application mgcpapp

port 1/0:15

!

and the VG200......

ccm-manager redundant-host 10.90.0.6

ccm-manager mgcp

!

interface FastEthernet0/0

ip address 10.92.0.201 255.255.0.0

load-interval 30

speed auto

full-duplex

!

call rsvp-sync

!

voice-port 1/0/1

cptone GB

description *** Education fax 3276 ***

!

mgcp

mgcp call-agent 10.90.0.5 service-type mgcp version 0.1

mgcp dtmf-relay voip codec all mode cisco

mgcp package-capability rtp-package

mgcp fax t38 inhibit

!

mgcp profile default

!

dial-peer voice 2 pots

application mgcpapp

port 1/0/1

!

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1 REPLY
Bronze

Re: Fax Relay and MGCP

The Cisco Fax relay is not possible using MGCP. Only H323 or SIP works for Cisco Fax relay.

For the T.38 fax relay, you could refer the following document

MGCP Based Fax (T.38) and DTMF Relay

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a0080087eb3.html

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