[OpenSIPS-Users] SEAS connector for external AS

[Stefan Sayer]

Hello,

Thomas wrote:
> Hello all, 
> 
> I am the main developer of Cipango (http://www.cipango.org), an Open Source SIP-Servlets Application Server (with HTTP and Diameter support). We have been using OpenSIPS together with Cipango in a couple of projects using plain vanilla SIP proxying from OpenSIPS to Cipango. 
> We have found out the SEAS connector which allows for a direct connection between SIPS and an external SIP AS. Since we are also adding HA features to Cipango, we were wondering whether this feature could be useful to have a front-end OpenSIPS distributing SIP messages to several SIP AS. 

if SIP processing in java is not prohibitively slow, I would recommend 
to stick to a native SIP stack (or somehow embed a C/C++ stack). 
Mainly for historical reasons, we had used SER as SIP stack for SEMS, 
another SIP media/app server, but it turned out that a native SIP 
stack and using SIP between proxy and app server has many advantages:

- performance is much better (even with optimized binary RPC, and only 
passing relevant info from SIP messages to app server - afaik SEAS 
sends the whole messages)

- standard SIP methods for load distribution, failover, overload 
handling etc can be used, they are all very well implemented in *ser/s-r

- configuration and system administration is much easier

- usually (in bigger setups), you have a lb proxy in front of the app 
server anyway

etc.

especially high load and overload situations are handled better using 
traditional SIP methods, which are known and by now also quite well 
engineered.

just my 2c (not having much experience with SEAS).
Stefan

> 
> As a starting point, we had a look at the SEAS documentation (http://www.opensips.org/html/docs/modules/devel/seas.html). Since it has a few broken links, we were wondering whether this module is still maintained and if it is intended to a be a generic one or mainly intended to weSIP ? 
> 
> Regards, 
> 
> Thomas
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