lkondeth wrote:
Are we assuming that the installation of our asterisk box is connected to pstn or a gsm modem to get the DID. or are we relying on 3rd parties to provide this information.
Either. Whatever is supported by Asterisk can be used with A2B.
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How is the CID passed to asterisk or a2billing?
In the SIP From: header, or in the Calling Party field of Q.931 calls.
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Is there anyone using public DID providers getting them to pass on missed calls as a SIP call and then using that information to make a callback?
I'm sure most users of A2B do exactly this. I certainly do on all the installations that I maintain.