SIP trunk is a type of service offered by the ITSP (Internet Telephony Service Provider) that provides telephony service over the Internet using technology called VOIP (Voice Over Internet Protocol). The ITSP may provide telephony service for residential customers, commercial users, or both. SIP trunk is normally provided to business customers who need more than one voice channel and which terminate as "trunks" on the customer's PBX.
An IP PBX with SIP trunk functionality can support services from the ITSP to achieve lower costs and increased functionality. When terminated on the customer's phone system, a SIP Trunk provides the "voice gateway" to and from the Internet. The voice traffic routed to the ITSP will be sent out via the trunk, which also provides an alternative interface to the existing PSTN (Public Switched Telephone Network). Often times, it will be used alongside the PSTN lines or replace the PSTN lines completely, with the traffic transported over an IP network. The availability, reliability and quality of the IP network are important considerations for businesses looking to upgrade existing phone systems. With proper network assessment planning and implementation, SIP trunks can deliver high quality and reliable service with substantial cost savings.
When the PBX extension user dials an outside party, the IP PBX will route the call request over a SIP trunk (voice channel) and deliver the necessary information to the ITSP. The channels use recognized standards for communicating over private IP networks and public Internet such as SIP and RTP protocols. If the number being called is a traditional PSTN telephone number, the IP packets will be routed to the PSTN gateway, which terminates within the dialed number area code. Since these calls do not originate on traditional PSTN lines, the usual long distance charges will not apply and instead the call is billed at lower or bulk rates established by the carrier… the ITSP. If the distant party has VoIP service, the SIP Trunk provider could route the call end-to-end without ever leaving the IP network.
DID (Direct Inward Dialing) is a very popular feature for larger enterprises that operate phone systems with digital trunks, such as T1/PRI. However, the costs of digital trunk service and the T1/PRI module are unaffordable for most small businesses. With SIP trunking, service providers are offering these similar DID functions at a lower monthly cost than standard analog PSTN lines. With IP-based phone systems that are properly provisioned, each user can have a unique public telephone number to ring at the desktop or at the main answering point. When an outside caller dials the DID number, the receiving party will receive the call from the path(s) terminating on the PBX. This service is also known as "virtual trunks" on phone systems since there is no hardware associated with any specific channel. When using the Syspine DOS-A50, there are no burdensome license fees for using SIP trunk software, resulting in the ideal solution for DID operation with small business phone systems.
Syspine Digital Operator Phone System
The Syspine RP IP-PBX base server is integrated with Microsoft Response Point software. The Syspine IP PBX supports SIP Trunk services with DID functionality. By doing so, any small business can have DID capability and enjoy increased business productivity at a much lower TCO (Total Cost of Ownership). Reduced telephone line and service costs.
As your business grows, SIP trunking allows you to scale your phone system faster and more cost-effectively than with traditional phone lines. The simple setup wizard in Response Point's Administrator enables the system administrator to quickly add new trunks/IP lines in minutes.
The current ITSPs working with Microsoft Response Point are listed below. These service providers are certified to fully inter-operate with the Microsoft Response Point software of the Syspine RP IP-PBX system. For additional information on these VoIP providers, click on the following links:
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