SIP makes use of what is known as the "trunk" in which the communication is channelled. The SIP trunk may be connected to an inside PSTN (public switched telephone network) line, whereby companies can communicate through their IP PBX system out world. In fact, with SIP, companies can replace analogue circuits and fixed PSTN lines using a more efficient IP phone system to make a converged line for multimedia communication.
Identifying a trunking provider who can meet your requirements may be the first step. Not all SIP providers supply the same level or combination of services. That includes you need to understand what is available and assess what your small business needs before approaching SIP providers for estimates. It can be a procedure that takes up a great deal of your energy. A new phone system is similar to an Ice Berg when the www.sip.us/ cost of the gear is clearly visible above sea level. The true expense of ownership, however, is below sea level rather than visible. The hidden area of the Ice Berg sank the Titanic and it will sink you if you do not discover it before you commit to a vendor. In your analysis of how much a telephone system costs, you need to look at the ongoing price of support. For reasons that I have yet to discover, this expense is often characterized as being a amount of your total phone system cost. For example, if the new phone system cost $10,000 to $100,000 your ongoing support contract might be 15% or $1500 to $15,000 annually moving forward. Most businesses currently manage phone traffic over expensive T1 lines (used for traditional digital telephone systems), or a PRI (Primary Rate Interface) on an ISDN system. A single T1, which can be by means of copper or fiber-optic cabling, can hold 23 concurrent telephone calls. If during peak call times, it can be conceivable that inbound and outbound calls could exceed that capacity, the business will likely need to purchase additional T1's (each adding 24 additional channels) for anyone times that additional capacity is necessary. In an organization with multiple locations, this procedure is commonly repeated at intervals of location to guarantee sufficient capacity. It becomes apparent the costs can rapidly add up, often on capacity that is only rarely utilized. 1. What are the 5 nines and just how can they impact reliability? 2. Uptime - how would you view availability as it relates to reliability? 3. How is an IP system deployed? 4. What architecture does the system employ? 5. How many points of failure does the machine have? 6. Can your network provide the platform to get a reliable IP system? 7. What about redundancy and how important should this be? 8. How important is maintenance?
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