[Asterisk-Users] Connecting to a cluster of SIP servers

[Douglas Garstang]

> -----Original Message-----
> From: Aaron Daniel [mailto:amdtech at shsu.edu]
> Sent: Monday, April 24, 2006 10:06 AM
> To: Asterisk Users Mailing List - Non-Commercial Discussion
> Subject: RE: [Asterisk-Users] Connecting to a cluster of SIP servers
> 
> 
> On Mon, 24 Apr 2006, Douglas Garstang wrote:
> 
> > You can't use round robin DNS. Round robin DNS will cause 
> every SIP packet to potentially go through a different static 
> path, which will break things.
> 
> Huh?  Has this happened to you in practice?

It sure has. Polycom phone queries DNS for domain.com and gets round robin IP of 192.168.10.1. It sends a REGISTER request to that IP. Asterisk at 192.168.10.1 sends back a 407 Proxy Auth required. The polycom phone then queries DNS again and gets 192.168.10.2 this time and sends the REGISTER with auth info included this time to Asterisk at 192.168.10.2. The Asterisk at 192.168.10.2 box goes 'huh. What the hell is this for?' becuase it never received the original REGISTER, and drops it on the floor. The phone never gets an OK to its register request.

Doug.