Need to Build a full SMS System & Web Portal

We need you to build a fully functional SMS System. Based in South Africa, this is our primary market, but also have contact in UK, USA and Australia, so would look to be able to send worldwide as required. Full reporting to be available, sent, delivered and undelivered and be able to export into csv. Full viewing history to be able to do likewise. Ability for clients to create a login and accounts from website. Enable price fixing for each account so credits applied automatically once payment received is input on the system, again full viewing history. Bulk import and export. Blacklist to be kept by client for each campaign they have rather than per account. Start/Send times to be specified by client, Monday to Sunday 00.00 - 24.00; enable to be changed as required. I'm sure if you've read this far you know whats required in order to build this. We want to make use of VoIP/SIP Trunks to send SMS as we were doing previously with another business partner. Each SIP trunk could send approc 12,000 SMS per hour which we want to replicate with this. SIP trunk costs around 20 USD per month per trunk, which you need to source. The SIP trunks must be 'pooled' rather than allocated to each account, this way they are maximised across all clients. Longcodes required for each campaign rather than per account, again you are required to source these also. ideally, we need system we can take over and order SIP trunks to system and longcodes as rrequired. Clients to have a 'sending rating' also so that a priority can be applied to SMS in queue making use of the trunks available. Priority 1 - takes precedent Priority 2 - only sends when there is capacity to do so Let me know your thoughts on this. Full database to be held centrally also of all sms sent. Ideally when importing if they can add other fields such as Name etc., so that when replies are received and they come to export, this information is also available, rather than just the cellphone number, as well as the campaign ID that the SMS was sent from. Also want to look at the possibility of bulk whatsapp and what that would entail. Regards