 you know all the standards are maintained in their development. Some service providers test the SBC with their existing network before they deploy it into the customer network. These might give you some level of comfort to buy the prod- uct. Here, we have compiled some questions for you: Which SIP trunk providers are product Interoperability Test (IOT) Certified? Which call servers are product IOT Certified? Is your product IOT Certified with any IP-PBX? If yes, ask for detailed information. Which SIP phones are product IOT Certified? Which SCCP phones are product IOT Certified? Does your company provide a managed service solution? If so, ask it to describe. Business In the whole process of bidding, you must check the business experience of the bidder. There are lot of companies (especially startups) that are coming into the market with bril- liant ideas and products. But, they may not sustain the business for a long period of time. You need to decide whether you can take a risk on any new company that might not stay in the market for a long time. If the company cannot sustain, your network will fall into severe risk. You might not find the right people to support the product. Moreover there will be no growth or roadmap of that product. That's why you need to check the bidder's business background and capabilities. In the last few years, we have seen many startup companies building SBC products. And today when we look back, most of them are gone or bought by their competitors. As the industry is still building new features on SIP, you need to check the following two things about the vendor: Bidder background Bidder references We have compiled a lot of questions to verify the bidders' business background and refer- ences. Please use these tools to measure their background before you select any of them. 186 SIP Trunking Bidder Background The bidder should provide the following details and background information for its company: Bidder trading name. Bidder tax ID/ABN and VAT number. Date the bidder company establis