05-07-2009 11:23 AM - edited 03-15-2019 05:54 PM
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.
05-07-2009 12:02 PM
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
05-07-2009 12:20 PM
Thanks for the response. What about G729 calls? Is it one per channel? What about transcoding? Is it one tracoding resource perchannel?
05-07-2009 12:26 PM
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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