[asterisk-biz] VoIP solution based on Asterisk for prepaid/postpaid billing

[Mark Scholten]

Hello,

Currently we are looking for a solution that offers a prepaid solution and a
postpaid solution for the following:
- Outward calling to all allowed numbers
- Inward DID (with for certain DIDs a rate per minute, but always a rate per
month)
- Fax -> email
- Free phone calls to numbers on the same system
- No pay per SIP/client account (for the license fee we pay if a license fee
has to be paid)
- Option to set a fee per SIP account
- Option to have different fees depending on what the client has ordered (1
SIP account cost more per account compared to having 10 SIP accounts)
- Incoming/outgoing using SIP trunks
- Billing via WHMCS/external tools (an API for this is nice, but getting the
data from a database is also possible), creating invoices that are created
directly can be disabled per account (or are not possible at all)

Nice to have (not required):
- Email -> fax
- Voicemail
- HA solution (possible across multiple datacenters/networks)
- Multiple outgoing/incoming SIP trunks, with automatic detection for the
best rate to use for an outgoing call
- Reseller options
- API
- Easy to provide list of prices (CSV import)
- SMS options

The requirements are what we now offer to our clients (monthly fee prepaid,
calling fee postpaid), but offering the other options (nice to have) are a
nice additional service. Also offering 100% prepaid is a nice additional
option.

What options (paid/free) are available for as far as you know?

Kind regards,

Mark Scholten