[cisco-voip] VG224 Analog phone dial-tone/dead-air issues

[Jason Aarons (US)]

Mgcp debugs, vpm signal, ios versions, callmanager versions.....

 

From: cisco-voip-bounces at puck.nether.net
[mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Aliberto, Nate
Sent: Wednesday, January 27, 2010 7:55 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] VG224 Analog phone dial-tone/dead-air issues

 

All,

 

During a recent UC rollout, we implemented a series of VG224s to provide
fax, modem and standard analog E&M services to a good number of devices
using MGCP for management.  I've observed that some of the analog phones
take an extraordinary amount of time to receive dial-tone again after
going back on hook. 

An example would be that a user will pick up the phone and begin dialing
a number realize it's incorrect and will go back on hook to get
dial-tone again, and after doing so they will simply hear dead air.
It's almost as if a return to hook is never picked up by the VG224 or
processed by CUCM.

I've been trying to determine what is actually occurring between the
VG224, CUCM and Phone in this scenario so that I can implement a
mitigation.  If anyone has seen this before or has some insight into a
Root-Cause/Resolution I would greatly appreciate it.

 

Thanks

 

Nate Aliberto

 

 
 
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