Others have commented on SER as CSCF. Without addressing the full shebang of what IMS implies for SIP support, your specific requirements below could very well be handled by user_preferences table and avpops (in 0.9, in 0.10 you have more flexibility and options).
g-)

Kamal.Mann@t-systems.com wrote:
Hi All
We are using SER as CSCF which communicates with HSS and Application Server. 
	Whenever a UA sends a request to SER then it should go to some specific table and look for services assigned to that particular UA. 
	If UA is authorize to use that service than SER send this to AS. 
	AS then send this request/response to Serving SER (S-CSCF) which further serves that UA.
I need your suggestions for the same that what kind of module we need to develop for this scenario or any valuable suggestions. 

Thanks in anticipation
Kamal Mann
  

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