Voice not clear

[tolen]

Hai all,
when dialing directly from my xlite, voice quality is good. But when dialing from vicidial , voice is not clear(I am not able to hear properly). This is happening when dialing over my SIP account. I tried changing the codecs(gsm then alaw/ulaw then both). Initially, I thought it is a problem with conference call.

But then, if I dial using PRI line, the quality is superb. I am stuck here. Any help is highly required and apreciated !!!

It is happening in both manual and autodial mode.

Asterisk: 1.4.21.2
Astguiclient: 2.0.4-119 BUILD: 71125-1751
OS: Slackware 12.1

[mflorell]

what codec are you using?

[tolen]

first, i tried with gsm, then with alaw and ulaw. Finally I enable both. After that again, I enable gsm only(this time I unloaded alaw and ulaw in modules.conf)

[mflorell]

What are you using for your zaptel timer?

[tolen]

I am using ztdummy for timer.

[mflorell]

That is most likely you problem. Also, you should check to see that your kernel process preemption is set to SERVER(no preemption), several distros(like CentOS) do not have this set and it can cause these audio problems.

[tolen]

I reinstalled the vicidial all over again with Slackware 12.0. An d the voice quality is ok now. It seems the problem was with gcc.

[vicidial]

i am facing the same problem with the same kind of configuration as mention above. with the ztdummy
over here instead of slackware i am using the centos 5.2 final(2.6.18-92.el5)


you should check to see that your kernel process preemption is set to SERVER(no preemption)

how to set the kernel process preemption to SERVER ?
is this problem will be solve if i install the vicidial with slackware12.0 ?

please help me out

[caloy]

You need to recompile your kernel, check the scratch_install document for the details.

[vicidial]

recompile kernel means , i have to upgrade to some other version ?