[cisco-voip] CF off net low audio issue

[Dennis Heim]

I ended up opening a tac case. Tac has some special tools just for low level analog trouble shooting.

Dennis Heim
Network Voice Engineer
CDW  Advanced Technology Services
11711 N. Meridian Street, Suite 225
Carmel, IN  46032

317.569.4255 Office
317.569.4201 Fax
317.694.6070 Cell
dennis.heim at cdw.com<mailto:dennis.heim at cdw.com>
www.berbee.com<http://www.berbee.com/>

From: Countryman, Edward [mailto:Edward.Countryman at provena.org]
Sent: Thursday, August 27, 2009 11:46 AM
To: Dennis Heim; cisco-voip at puck.nether.net
Subject: RE: CF off net low audio issue

Do you if there is a Cisco job aid for this type of work;  is most of this done in the router?  I don't necessary see anything on the CCM (mgcp) for this.

From: Dennis Heim [mailto:Dennis.Heim at cdw.com]
Sent: Thursday, August 27, 2009 10:37 AM
To: Countryman, Edward; cisco-voip at puck.nether.net
Subject: RE: CF off net low audio issue

You will need to play with your input gain and output attenuation. Additional, you may also need to do a tone sweep in order to get things like impedance correctly tuned. Prepare to spend a lot of time to get those analog lines tuned correctly.... Been there done that..

Dennis Heim
Network Voice Engineer
CDW  Advanced Technology Services
11711 N. Meridian Street, Suite 225
Carmel, IN  46032

317.569.4255 Office
317.569.4201 Fax
317.694.6070 Cell
dennis.heim at cdw.com<mailto:dennis.heim at cdw.com>
www.berbee.com<http://www.berbee.com/>

From: cisco-voip-bounces at puck.nether.net [mailto:cisco-voip-bounces at puck.nether.net] On Behalf Of Countryman, Edward
Sent: Thursday, August 27, 2009 9:50 AM
To: cisco-voip at puck.nether.net
Subject: [cisco-voip] CF off net low audio issue

I have several smaller physician offices that will forward their main # to an offsite answering service for after hours coverage.  The sites are all trunked with POTS lines connected to FXO ports on 28xx series ISRs.  So the incoming call on FXO port 1 effectively is sent back out on FXO port 2 etc.

The problem I have is that the audio level the caller hears is greatly attenuated; almost beyond discernment.  However if I call the far end directly the call is very clear so it appears my router is the problem.

Anyone have any thoughts on this?

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