SIP gateway security

[xujing]

I installed a SIP gateway and a sip server. It worked well. How can I restrict illegal SIP Server send request to My SIP Server??? Who can provide sample config about that deny illegal SIP Server send request to My SIP Server.

Thanks a lot!!!

[xujing]

I have done the following config:

sip-ua

authentication username 1001 password 1001

aaa username proxy-auth

registar ipv4:x.x.x.x

sip-server ipv4:x.x.x.x

I just want to deny illegal SIP server send request and make a illegal free call.