I am re-posting this project due to failure from provider.
We need a serious professional to install and configure an OpenSER (Kamailio) + Asterisk + A2Billing platform.
- OpenSER should act as Registrar with Nathelper + RTPProxy/MediaProxy and it should allow local users to call each other without passing through Asterisk. It should also route international calls (011/00 prefix) to Asterisk + A2Billing. OpenSER should use a View of the A2Billing database to authenticate users.
- Asterisk + A2Billing should be configured so that new user accounts would be created/added in A2Billing. Also, each user should have their own voicemail account and OpenSER should route unanswered/failed calls to the user's voicemail.
- Wholesale inbound calls should be authenticated by IP address.