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VG204 MGCP configuration

Unanswered Question
Apr 11th, 2012
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Hi       There

Could someone help me to configure the VG204 as MGCP fax gateway?

I configured the gateway which connect to our fax machine

I have configured the VG204 as MGCP fax gateway and it already registered to our call manager(version 7).

there are 2 questions

1 is when try to configure the Subunit, it asked to choose port type (POTS, loop start and ground start), I am not sure which one should I chose

2. I chose the port type as POTS and the gateway registered to the call manager sucessfully, but I can not make fax call

     if I try to ring from the fax machine after i dial the first number i will hear the busy tone

     if I ring from normal IP phone to the fax number which connected to the VG204, it keeps ringing and would not change to fax dialtone

I checked the cisco website and could not find any information about the configuration on the call manager

Thank you in advance

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Overall Rating: 5 (1 ratings)
Gajanan Pande Wed, 04/11/2012 - 00:21
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If you want to connect any analog phone or FAX machine to that port, you must choose either loop start or ground start.


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michelnasr Wed, 04/11/2012 - 00:52
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To make a call from the fax machine, you need to apply the correct CSS under its directory number.

For the fax incoming call, can you please post your configuration on the VG204 ?

i guess it's a t38 protocol not applied under your dial-peers.

michelnasr Wed, 04/11/2012 - 00:57
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PS: you may need to check under the Fax menu, if it is set to auto-answer.

paolo bevilacqua Wed, 04/11/2012 - 02:57
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Why MGCP? For fax ou should use H.323, or SIP. And for phones, SCCP.

yixiu0317 Wed, 04/11/2012 - 18:02
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Hi          Paolo

When I choose the protocol, it only have MGCP and SCCP for the VG204 gateway in the CUCM, could you show me where can I select the protocol as H323 or SIP

Thank you in advance

yixiu0317 Wed, 04/11/2012 - 18:00
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I found out it was my human error caused the problem

For the outbound problem, it was because i plug the cable in the wrong port, but if I choose ground start I could not hear the external dialtone, I have to use loop start to make it work

For the inbound problem, because before i add the VG, there was already an ATA associated with the number, when i dialed the number it went to the ATA

Sorry for the confuse caused by my stupid error


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