[sr-dev] topoh module questions

[Daniel-Constantin Mierla]

Hello,

On 7/1/10 10:41 AM, jerome.marchet at orange-ftgroup.com wrote:
>
> Hi all,
>
> I have a question about the topoh module.
>
> I want to know why do you prefer to encode and decode SIP routing 
> fields instead of remove and add its. Is it a possible improvement for 
> future versions of kamailio?
>
the goals of topoh module were set to offer topology hiding 
functionality within a proxy, so right now it offers:
- topology hiding even for transaction stateless mode (not even tm is 
required)
- transparent mode for config file - inside the config, you will see the 
plain sip message, without any encodings
- it survives restarts - restarting the sip server has no impact on 
ongoing calls
- works over distributed farm of sip servers - encoding can be done by 
one instance, decoding works fine on another one that shares the same 
secret. This is good for HA, where invite was processed by active server 
and the bye happens to be processed by standby because HA switched. 
Another case is for load balancing, no need to care of routing messages 
within a call to same box
- high performance for call processing - it can easily handle thousands 
of call setups per second, which is hard to achieve in b2bua

What you suggest is a b2bua and there are many options already 
available. For example SEMS (SIP Express Media Server) has an 
application for sip signaling only back to back user agent. Also, same 
can be achieved more or less with asterisk or freeswitch.

Cheers,
Daniel


-- 
Daniel-Constantin Mierla
http://www.asipto.com/

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