[cisco-voip] T38 between mgcp and h323

[Kris Seraphine]

Hi

 

I'm trying to fax over a WAN link between an H.323 gateway on one side
and a MGCP gateway on the other. 

 

If I send the fax from the H323 side, it completes successfully but if I
send from the MGCP side it fails.  I think it's a configuration issue on
the MGCP side since I'm not 100% clear on how it should work. 

 

When I attempt a fax from the MGCP side, the gateways switch to fax
relay mode but the fax machines can't seem to train up correctly and the
call eventually disconnects.  The H323 destination gateway shows failure
to train messages in the t30 debug.

 

The gateway configurations are shown below.  I've tried with and without
the ccm-manager fax protocol cisco and mgcp package-capability
fxr-package commands since I'm not sure if they should be enabled or
not. 

 

MGCP Gateway

 

ccm-manager mgcp

no ccm-manager fax protocol cisco

ccm-manager music-on-hold

ccm-manager config server 192.1.203.21  

ccm-manager config

 

mgcp

mgcp call-agent 192.1.203.21 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 package-capability rtp-package

no mgcp package-capability res-package

mgcp package-capability sst-package

no mgcp package-capability fxr-package

no mgcp timer receive-rtcp

mgcp sdp simple

no mgcp fax t38 ecm

mgcp fax t38 nsf 000000

mgcp fax t38 gateway force

mgcp rtp payload-type g726r16 static

mgcp bind control source-interface FastEthernet0/0.2

mgcp bind media source-interface FastEthernet0/0.2

!

mgcp profile default

!

!

dial-peer voice 1 pots

 application mgcpapp

 port 1/0:0

 

H323 Gateway

 

dial-peer voice 4880 pots

 destination-pattern 4880

 port 0/0

!

dial-peer voice 4881 voip

 destination-pattern .T

 no modem passthrough

 voice-class codec 1

 session target ipv4:192.1.200.21

 incoming called-number .

 fax-relay ecm disable

 fax nsf 000000

 fax protocol t38 nse force ls-redundancy 0 hs-redundancy 0 fallback
none

 no vad

 

Any suggestions would be appreciated.

 

Kris Seraphine

 

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