[asterisk-users] SIP Listen Multiple Ports

[Steve Edwards]

Un-top-posting...

> On Sun, 3 Jan 2010, Steve Edwards wrote:
>
>>> You can configure OpenSER/Kamailio/OpenSIPS to listen to multiple 
>>> addresses and ports and "forward" to Asterisk on the same or different 
>>> boxes.
>>>
>>> I like to configure systems with OpenSER running on each box, 
>>> forwarding calls to Asterisk across the same set of boxes for 
>>> redundancy, load balancing, and maintenance (being able to take an 
>>> instance of Asterisk or an entire box out of production).

On Mon, 4 Jan 2010, Michelle Dupuis wrote:

> Could you explain this one a bit more...
>
> You run openSER on the same box as asterisk, and have multiple such 
> boxes, with the purpose of failover?  But if a box goes down with 
> openser on it, then there is no forwarding.  (And most phones can only 
> reg with peer). If you move openSER to another independent box, then you 
> have a single point of failure.
>
> I suspect I'm not understanding something correctly....

This is for a system advertised with those "cheesy" late night cable TV 
ads -- "hot" girl enticing you to call for a "free" chat and talk with all 
your "friends..."

The hosts are located in a rural telco. The telco switch (Taqua 7000 as I 
remember) can hand off the call to a couple of IP addresses. Each of these 
addresses is on a separate host with OpenSER (it's been a few years) 
listening to 5060. Each of these hosts is also running Asterisk (1.2) 
listening on port 5061

There are no phones registering with any host. All calls come in through 
the Taqua or IAX when I need to test something.

Each instance of OpenSER is configured (dispatcher.list) to distribute (no 
active load balancing) calls to all of the instances of Asterisk, 
including the instance running on the same host.

If I want to take an instance of Asterisk down for maintenance, I just 
comment out the address associated with that instance out of 
dispatcher.list, restart the instances of OpenSER and wait for the 
in-progress calls to time out.

If a host crashes, the Taqua detects that and doesn't send calls to that 
instance of OpenSER anymore. Each remaining instance of OpenSER will send 
calls to the remaining instances of Asterisk.

-- 
Thanks in advance,
-------------------------------------------------------------------------
Steve Edwards       sedwards at sedwards.com      Voice: +1-760-468-3867 PST
Newline                                              Fax: +1-760-731-3000