Sip problem

Iam not able to make SIP call betwwen client & server
My sip .conf

[code][general]
bindaddr = 0.0.0.0

[2000]
type=friend
host=dynamic
qualify=yes
username=2000
allow=all
port=5060
nat=never
secret = password
dtmfmode=rfc2833 ; Choices are inband, rfc2833, or info
context=sip
callerid=“user1”

[5000]
type=friend
host=dynamic
qualify=yes
port=5062
allow=all
username=5000
nat=never
secret = password
dtmfmode=rfc2833
context=sip
callerid=“user2”
[/code]

Extension.conf

[code][sip]

exten => 2000,1,Dial(SIP/2000)

exten => 5000,1,Dial(SIP/5000)[/code]

2000(on server computer ) is able to get registered but 5000(client) is not .Earlier this was working fine but not now .Does anyone has got the solution

Set the nat=yes for 5000 user and check …