Help me Please. Marketing Ideas needed for Business.

Hello.

I have a VOIP company that provides VOIP for calling cards services. We are a solution provider for Telecom based companies. We provide services for long distance companies.

We also provide;
1. Turnkey solution for prepaid / postpaid calling cards
2. Billing software for calling card companies
3. Billing software for carriers
4. Carrier Services.
5. Hosted billing services.
6. Internet telephony service
7. consulting.

I need ideas. Where do I market my company, where do I take it? How do I get distribution channels?

What is the best strategy to use for effective results. Basically this is Business to Business marketing.

We already have a base of current and future clients that we are working on. Our closing ration is 5:1

This is very, very important for me. I know there are many marketing experts here, so please help me out. Just some ideas.

Thank you.