Asterisk/VOIP developer needed

We already have asterisk server setup and running. We need the follwing project to be delivered at the earliest. While replying pls quote ONLY IF you have done any similar type of project before. Model 1 : One Toronto number to One Pakistan # Use case : 1. Both Caller (Toronto) and Callee (Pakistan) are registered on our system (caller IDs) 2. Caller from Toronto calls a local DID (647 xxx) Caller is in conference 3. system makes a call to calleee in Pakistan (Something like miss call, so callee calls the local DID.) 4. This call is just to inform callee, caller is available in the conference room 5. Caller waits for callee for 5 minutes (IVR prompt changes *), if callee doesn't call caller in 5 minutes, system informs caller callee is not available and exit 5. Callee in Pakistan calls a local Pakistan DID (example Karachi #) 6. call is connected This model only supports one Toronto number to one Pakistan number. But must be extended from one to many. We need to register these customers from the admin panel. ** Also need to create 'dynamic' conf rooms depending on the callers ** Must reuse all the channels on the provided DIDs (each DiDs may have 2 channels, so 4 calls for 2 DIDs). Once again, Pls quote if you have done similar projects in past and well versed in agi scripts. Theres a possibility of extension and similar type of projects once this is completed in time with quality. Also mention the timeframe.