SIP Redirect

The LTM can certainly redirect SIP requests. I've seen it implemented at several companies in configurations where the initial SIP INVITE message is load-balanced by the LTM between several SIP endpoints, but after that the endpoints talk directly to each other without having to worry about VIA headers thru the LTM. I've also seen the LTM configured to send OPTIONS messages to the endpoints to validate their status.

 

 

In other situations, I've written iRules to modify the SIP headers to correct implementation problems with endpoints, such as anonymous call INVITE and CANCEL messages. Some of them are already posted in previous threads.

 

 

Dave