How many calls can be made with a PVDM2-48 ?

Unanswered Question
May 7th, 2009

I'm having voice quality issues. During a conversation, a call gets more and more faint going into a metalic sound to the point where you just hang up.

This happens on calls to the PSTN and accross the WAN. The router has a PVDM2-48. How do you calculate how many calls can be made with this PVDM? How do I know if I'm going over the alloted resources?

I did a test and got this. Does it mean I missing something?

Select option : 16

DSP Keepalive Status Display:

=============================

DSP 1 is Alive, State: 4, Keepalive Sent: 190395, Skip 321072

DSP 2 is Alive, State: 4, Keepalive Sent: 254779, Skip 256688

DSP 3 is Alive, State: 4, Keepalive Sent: 255733, Skip 255734

DSP 4 Not Exist

Thanks.

I have this problem too.
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Jaime Valencia Thu, 05/07/2009 - 12:02

no, a PVDM2-48 has 3 DSPs

each channel can support a call with G711, so those are 48 calls if you're only using them for media termination.

i recall some bugs causing metalic sound, might be a good idea to upgrade the dsps FW

HTH

java

if this helps, please rate

d.anthony.hadley_2 Thu, 05/07/2009 - 12:20

Thanks for the response. What about G729 calls? Is it one per channel? What about transcoding? Is it one tracoding resource perchannel?

rob.huffman Thu, 05/07/2009 - 12:26

Hi D.Anthony,

Just to add a note to the good tips from Java (+5 points my friend)

CSCsd90851 Bug Details

One way Robotic and Metallic voice towards PSTN through 2800

Symptom:

Voice calls through a 2800 gateway starts experiencing Robotic and Metallic voice after a few days of operation. When the problem does occur, it happens on all the calls through the gateway.

Condition:

Observed on a 2851 running IOS release 12.4(3a)

Workaround:

A reset of the DSP or a router reload resolves the problem.

Status

Fixed

Severity

3 - moderate

Last Modified

In Last Year

Product

Cisco IOS software

Technology

1st Found-In

12.4(3a)M

Known Affected Versions

Fixed-In

4.4(19)DSP

6.3(5)DSP

7.4(2)DSP

8.4(0)DSP

12.4(11)T

Hope this helps!

Rob

PS:Thanks for the Bug Nick!

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