The purpose of this week’s assignment is to discuss what a SIP trunk is, why you would use a SIP trunk, the equipment required for its use, and any RFCs that discuss SIP trunking. After compiling some research I have concluded that SIP trunking is a direct connection between your organization and an Internet service provider. It enables you to extend voice over IP telephony beyond your organization’s firewall without the need for an IP-PSTN gateway. This simpler configuration is easier and less expensive to design, operate, maintain, and upgrade. And because ITSPs deliver services at substantial savings, your investment in SIP trunking can give a quick and substantial return on investment (Microsoft). There are several advantages to utilizing a SIP trunk to include the following: save money on long distance service, eliminate IP-PSTN gateways, eliminate a redundant network, eliminate BRI and PRI subscription fees, and extend the capabilities of Office Communications Server with new services from ITSPs. A SIP trunk can be deployed over the Internet or over a line that is dedicated to your organization and that may or may not share bandwidth with other IP traffic. A dedicated line such as a T1 line between your organization and the ITSP usually costs the most, but it can typically carry the most simultaneous calls and offers the highest security and reliability. If your organization has lower call volumes or less stringent security
