How to configure VG224 Analog gateway using MGCP

Unanswered Question
Sep 29th, 2009

Dear Collegue,

Existing VG224 Analog gateway is working fine connected to fax machines running h323 protocol. We want to activate the Force Authorization Code to conrol the facilities and this will work only in MGCP Protocol.

Your output and quick solution is highly appreciated.

Thank you

I have this problem too.
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JUNKSA_2 Wed, 09/30/2009 - 07:13

Dear Virender,

The doc is okay. Do you have anything specific for the configuration of Fax Machines using the VG224 using MGCP Protocol to run the Force Authorization Code.

Your quick reply is highly appreciated.

Thank you

JUNKSA_2 Thu, 10/01/2009 - 00:06

Hi Virender,

Thanks a lot. I will try to apply the sample config and see.

I will drop an e-mail if I need more help.


Nicholas Matthews Thu, 10/01/2009 - 04:42

This is actually not true.

MGCP supports:

NSE based T38

Protocol based T38

NSE modem passthrough

modem relay

cisco fax relay

H323 supports:


Protocol based T38

NSE modem passthrough

protocol based pass-through

modem relay

cisco fax relay

The difference here is NSE is 'passthrough' and protocol based is pass-through.

If you're using a SIP provider for instance, and they're doing passthrough, you won't be able to use MGCP in the call flow.


JUNKSA_2 Fri, 10/02/2009 - 21:26

Hi Nick,

Thank you for your feedback. Do you have any sample config that will help to establish the fax machine that was connected to VG224 Analog Gateway using MGCP protocol. The reason why they want to use MGCP is to use the Force Authorization Code for Fax Devices.

Any comments and suggestion is appreciated.


Nicholas Matthews Mon, 10/05/2009 - 05:30

This depends entirely on which of the above options you want to use. There are about 4 different ways.


Hythim Ali El Hadad Wed, 09/30/2009 - 01:33


I think it is related to CSS applied to the phone, so you can try it using sccp for the VG224 so as to not missing the great fetaures of it



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