asterisk users - Jul 2009 - Why Asterisk + Kamailio ?

Why do I see many setups where there is an Asterisk server in
combination with a SIP-server like OpenSER or Kamailio ?
Isn't Asterisk enough as SIP-server ??
It can communicate with many databases through ODBC, with many other
software through an API (AGI), with other servers like OpenFire for
jabber,...

Why is there an extra SIP server implemented at many VoIP-providers ??

Jonas.
-------------- next part --------------
An HTML attachment was scrubbed...
URL:
http://lists.digium.com/pipermail/asterisk-users/attachments/20090702/b2740244/attachment.htm

On Thu, 2 Jul 2009, jonas kellens wrote:
> Why do I see many setups where there is an Asterisk server in
> combination with a SIP-server like OpenSER or Kamailio ?
>
> Why is there an extra SIP server implemented at many VoIP-providers ??
OpenSER/Kamailio are supposed to be much better dealing with a bazillion 
users.

I like to "front" Asterisk because it lets me "load balance"
and take an
Asterisk server out of production without disrupting calls in progress.

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