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
audio.

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.(
http://beetel.quasar.in/magiqII ), which is rebranded version of huawei
ideos S7 tablet
(http://www.huaweidevice.com/resource/mini/201008174756/ideos/products_s7.ht
ml)

I use D-link DIR-615 WIRELESS N 300 ROUTER
(http://www.dlink.co.in/products/?pid=349) as wireless access point.

I have try two android video softphone on my tablet.

1> Voipswitch :
http://voipswitch.com/en/products/softphones/mobile-softphones/softphone-for
-android/

2> Linphone (1.2.2) :
http://www.linphone.org/eng/download/packages/android.html

* i also try both codec( G729 , G711)

* android tablets and asterisk server are connected in Local Area
Network(LAN).