A2billing callshop module - open to bidding

We need a web- base Callshop billing Solution for my website that can cater for 10-50 Callshops open source (Startshop or better) or proprietary with the following functionality: -Simple and User friendly interface -Web based Callshop Solution -Support multiple SIP Termination Account -Create Reseller Accounts (Optional) -Create Multiple Callshops -Support Multiple tariff -Multiple currencies -Realtime billing -Multi language interface (e.g. English, French,) -Import, Export & Edit Rates for individual Callshop -Prepaid or postpaid billing for booth/Callshop or reseller -Booth lock/unlock -Assign Grace period for Callshop (Don't bill calls shorter than specified Duration) -Manually force hangup of calls which are in progress -Individual invoice printing for each callshop -Search rate per destination or prefix in booth interface -CDR per booth/callshop/destination/time period -Display Profit -Create Operator or Administrator