Asterisk Forbidden Error

Question

When I try to perform authentication process in asterisk by using jain sip library, it gave 200 ok message for only one extension , but I tried same code for different extension , it shows 'Forbidden' message. I have verified credential I have passed in my program

Answer 1

Forbidden can be caused by

1) incorrect realm. You are using no realm= line in sip.conf or using other realm

2) incorrect password

3) incorrect nat settings.

Answer 2

Generally This error occur when u enter the hostname instead of the IP address.