[Serusers] Voice problem

[ram]

Hi all

I have installed CDROUTER working fine for 30days now

almost all iam able to see 120 users calling at a time no problem

but past 7days iam getting lot of voice breaking problems
and other side not able to hear my side voice

my Server config

Xeon with 1 GB Ram 86GB hdd
and most of the time looks like below

~# free
             total       used       free     shared    buffers     cached
Mem:        903484     897328       6156          0       1892     830208
-/+ buffers/cache:      65228     838256
Swap:            0          0          0

when i check top
Cpu use is 2% only

when i configure directly with provider using PAP2 , voice is clear

can some one guide me what is the problem

how can i test and how can  i resolve this problem

help will be appriciate

Ram
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