VG224 SCCP and Modems..

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Feb 11th, 2010
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I am cureently trying to get modems to work over an SCCP VG224 with CallManager 7.  At present the modems can recieve but cannot send.  The PSTN gateway they are using is MGCP and everything is configured for Modem Pass through end to end.  Has anyone seen anything like this before?



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paolo bevilacqua Thu, 02/11/2010 - 07:10
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Modem passthrough doesn't seem a good idea.

Should use modem relay and H.323.

Or place FXS cards in router, end of any trouble,.

stowellp Thu, 02/11/2010 - 07:14
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I found that VG224's are great for Fax's, but not for modems. I use ATA

186/188's for modems as they worked without any issues.


Jason Hendrix Wed, 10/26/2011 - 13:37
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Maybe a little on the late side but... have a VG2951, VG224 CUCM 7.1.3 H323. Gas company calling inbound on DID line through VG224 and they could not connect did the changes to the port below and Gas compnay can now connect to modem, all the best.

conf t

voice-port 2/xx


input gain 6 <-- normally at 0

output attenuation 10 <-- normally at 0

idle-voltage high

no shut


write memory

show run and look for port


voice-port 2/11

input gain 6

output attenuation 10

timeouts initial 60 <-- was already set to this

timeouts interdigit 60 <-- was already set to this

timeouts ringing infinity <-- was already set to this

description Gas Modem Line x143 <-- add a description for me



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