Thanks all for ur participation and kindly advise.

As I noticed that jitterbuffer could help if the ping does not have request 
time out but the voice is also cutting .. but in that case, I have to set the 
jitterbuffer at the IP Phones and Asterisk boxes.

I have a polycom phone for example, and to set the jitterbuffer there are the 
following paramters:

Payload Size  
Jitter Buffer Minimum  
Jitter Buffer Shrink  
Jitter Buffer Maximum  

When it use the minimum, and when it use the Shrink and when it use the maximum?

If to look at the asterisk (in the SIP or IAX files) then there are a paramters 
for the jitterbuffer also, but really I am not able to know when to use this 
and when to use this:

jenable, jbforce, jbmaxsize, jbresyncthreashold, jbimpl, jblog

How to use the jbresyncthreashold? In which case?

Regarding to the QoS, which will be need in case having a packet loose, correct?

I just need to ask about something:
What I will be able to do if my ISP did not setup the QoS at his side? What 
kind of settings I can do in my DSL router (in case of Cisco, or in case of 
Linksys that running linux firmware)?

>From the other side, if I used linux server to set the QoS, so do I have to 
>let all the network elements to pass this linux server (so it will be the 
>default gateway for other elements)?

Appreciate the kindly help.
Regards
Bilal


      

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