For a start you joker, mind your language and remain in limits. You are a shame to the human race, moreso to Pakistan. Blabbering on about your expertise in VoIP and Telco equipment does not prove any point. For startups, I would highly recommend a hosted call center solution until they are large enough to have one inhouse. A call center’s money making portion is telemarketing/inbound support, NOT NETWORK SUPPORT. And unlike your bullshit, I have actually worked for 4 yrs in managerial positions in call centers and represent the largest hosted call center solution provider in the world.
I would strongly suggest to all friends here that weight all your options, consider all posibilities and decide depending on your business model and implementation plan.
Good luck to you all.