How to improve sound quality at callee side


I configured Asterisk on ubuntu. It works fine.

I want to play a sound file at the callee side, when the call comes at asterisk from any Soft phone. I tried the following dial plan in extenstions.conf file:

exten => 123, 1, Dial(SIP/123, 20, A(/home/soundfile))

With this configuration sound is played at callee side but it is of very poor quality. Same file is playbacked with good quality to the caller side.

Any help appreciated,

Tejinder Singh.