Ravin Suri writes:
 >  
 > 2. Now instead of SER directly relaying the call to the pstn gateway's IP
 > address, it sends it to a SEMS application which is setup to be a B2BUA with
 > media.  

you don't need to relay media through sems if you control or trust the
gateways.

 > 3. The SEMS application relays the call to the pstn gateway.
 >  
 > 4. It then writes a record to the database when the call starts and updates
 > the record when the call terminates.
 >  
 > My questions are:
 >  
 > 1. Is there a SEMS app that I can customize to do this?

see any of the a2bua apps/examples.

 > 3. How can we write to a database directly in a SEMS application?

if you use ivr, you can write easily to db using python db api.

-- juha
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