echo & audio delay in SIP VOIP

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Hello sir,

There is an echo problem in sip voip call. I think it is because of delay in

Let me try to explain you my system setup.

I have test asterisk on two different system.

System : 1>

OS : Ubuntu(10.04)Lucid

System Type : x64-based pc

Processor : Intel(R) Core i5 CPU M520 @ 2.40GHz

RAM : 4.00 GB

System : 2>

OS : CentOS (5.7)

System Type : x86-based pc

Processor : Intel(R) Pentium D CPU 3.00GHz

RAM : 1.00 GB

I use beetel magiq android tablet as video sip dialer.( ), which is rebranded version of huawei
ideos S7 tablet

I use D-link DIR-615 WIRELESS N 300 ROUTER
( as wireless access point.

I have try two android video softphone on my tablet.

1> Voipswitch :

2> Linphone (1.2.2) :

* i also try both codec( G729 , G711)

* android tablets and asterisk server are connected in Local Area