I was setting up CUBE-SIP-to-SIP trunk for PSTN. This router is also set up for SRST and it has relevant dial-peers configured. After configuring this I saw following messages trying to send the register messages to registrar:as.nipt.telstra.com. The service provider saw those message as well. To stop this initially I shut down all the dial-peers and later I had to add "no sip-register" and after no shut I can see those messages have stopped. I am now wondering why this happened? Why these dial-peers were sending the messages? Is adding "no sip-register" a solution or just a work around.
Nov 8 16:36:58.242 ACST: //-1/xxxxxxxxxxxx/SIP/Msg/ccsipDisplayMsg:
REGISTER sip:as.nipt.telstra.com:5060 SIP/2.0
Via: SIP/2.0/UDP 10.20.251.45:5060;branch=z9hG4bK5414D2
Date: Tue, 08 Nov 2011 07:06:58 GMT
CSeq: 91 REGISTER
Adding the no sip-register is the solution on this, by default the gateway will try to register with SIP or gatekeeper depending on what you have configured any number on the configuration either on a DN or destination pattern.
The no sip-register is the solution on this.