I have 8+ years of experience in asterisk. I have installed & deployed multiple asterisk based servers. Also i have integrated the asterisk servers with multiple other VoIP based products & other PBX's through SIP. I can assure you complete satisfaction on this project.
Please contact me on Skype for further discussion. My skype ID is: apctelco
Voice allocations development, various integrations and api is my everyday job.. Definitely I will help. However price is not final, it depends on scope that we have to discuss first, your project description is tiny