Hear playback

Hye
i want to dial playback sound from server to client or vice versa through sip . I meant if from server i dial to client (vice versa) & when client coneect it server should hear a playback music
I am using xlite ,can anyone help me

I tried to something in exten.conf & sip.conf file

exten.conf

[code]
[1000]
type=friend
host=dynamic
defaultip=192.168.1.48
username=1000
secret = password
dtmfmode=rfc2833
mailbox=1000
context=sip
callerid=“user1”

[2000]
type=friend
host=dynamic
defaultip=192.168.1.40
username=2000
secret = password
dtmfmode=rfc2833
mailbox=2000
context=sip
callerid=“user2” [/code]

sip.conf

[code][sip]
exten => 1000,1,Dial(SIP/1000)
exten => 1000,n,Answer()
exten => 1000,n,Background(main-menu)
exten => 1000,n,WaitExten()

exten => 2000,1,Dial(SIP/2000)[/code]

But when iam dialing 2000(client) to 1000(server) iam not able to hear voice ie connecting between 2 system is alright but after that blank .