[cisco-voip] PVDM

[Ryan Ratliff]

Your failing inbound calls could be because your provider is trying to send a call to you on a b-channel that doesn't exist on your side.

A 'debug isdn q931' for a failing call should confirm this.

-Ryan

On Dec 4, 2009, at 1:59 PM, Kim, Hyoun S wrote:

Oh sorry.  The voice port on the router is PRI.  I noticed when configuring the channels on the PRI, I could only specify channels 1-14 (rather than 1-24).
 
I know about the PVDM calculator, but this equipment was ordered by my manager and then given to me to deploy.  I can always try & pop in a new PVDM with more DSPs in the router, but I am trying to figure out why some numbers can’t be dialed (or can only intermittently be dialed).  I am not sure if the PVDM capacity is at fault or not.
 
Hyoun Kim
Network Administrator I
Charter Media - East Division
640 Broadmor Blvd, Suite 80
Murfreesboro, TN 37129
 
Email: Hyoun.Kim at chartercom.com
Office: 615.217.6245
Fax: 615.217.6255
 
From: Jim Reed [mailto:jreed at swiftnews.com] 
Sent: Friday, December 04, 2009 12:56 PM
To: Kim, Hyoun S; cisco-voip at puck.nether.net
Subject: Re: [cisco-voip] PVDM
 
What kind of voice ports do  you have on the router?  Analog POTS or PRI or...

If you don’t have enough PVDM capacity, you can’t configure all of the channels on the PRI or all of the POTS lines.  There is a DSP/PVDM calculator on Cisco’s website that will tell you how much you need for a particular configuration.  Based on your symptom description, I’m not sure that this is your problem but never say never.
-- 
Jim Reed
Technology Wrangler
Swift Communications, Inc.
970-683-5646 (Direct)
775-772-7666 (Cell)

“Not only is it not right.
It’s not even wrong.”
       The Pauli Proverb
        Wolfgang Pauli


On 12/4/09 11:37 AM, "Kim, Hyoun S" <Hyoun.Kim at chartercom.com> wrote:

What specifically happens (or can go wrong) when you do not have enough DSPs on your PVDM module for a VoIP deployment?  Like for instance, if you have about 24 phones + 1 VG204 and you used a C2811 router with (1) PVDM2-16 and (1) VWIC2-1MFT-T1/E1.
 
I’m curious to know if the PVDM2-16 is my problem. I converted an office earlier this week to Cisco VoIP with the above equipment.  However, I’m finding that while outbound calls can be made (not sure how many simultaneously), I’m having a problem of people dialing in and getting a message saying that the call could not be completed or is disconnected.  I did not change any of the phone numbers and the number pool is the same.  The problem is random.  It occurs on some phones, then goes away.
 
Any ideas?
 

<image001.jpg>


Hyoun Kim • Network Administrator I – East Division

640 Broadmor Blvd • Suite 80 • Murfreesboro, TN 37129
' 615.217.6245 • ' 859.312.6941 • 7 615.217.6255 • * Hyoun.Kim at chartercom.com <mailto:Hyoun.Kim at chartercom.com>



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