SIP trunking is Voice over Internet Protocol (VoIP) and streaming media service based on the Session Initiation Protocol (SIP) by which Internet telephony service providers (ITSPs) deliver telephone services and unified communications to customers equipped with SIP-based systems or software.
- Number of available trunks is based on of available bandwidth, not physical circuits.
- Session Border Controllers (SBC) may be required for security. SBCs can be a significant cost.
- Scales up or down easily and quickly and can offer automatic and on-demand capabilities.
- Automatic re-routing capabilities allow practical geographic distribution of connectivity to sites with limited network redundancy.
- Can be designed to retain PSTN capacity in the event of the loss of hardware without the need to build in excess capacity.
- A variety of pricing models including on-demand capacity.
- IP Trunking costs are likely to be significantly lower.
- Additional capacity can be as simple as a software change.
- Providers are likely to offer burst capabilities to accommodate brief periods of higher than anticipated utilization.
- The technology allows for automatic call rerouting to pre-defined locations should the location go offline.
- Each circuit requires physical connection and sometimes costly hardware.
- Scaling up requires the installation of new circuits and additional termination hardware or monthly cost at specific increments.
- Providing sufficient backup circuits to remote sites can be expensive.
- Only way to accommodate loss of hardware or facility where PRI’s terminate is to build-in excess capacity with associated cost impact.
- Cost is usually per circuit per month.
- If you require one, or a few, more voice channels than the fixed increment, the cost model for PRI is inefficient.
- Additional capacity must be planned well in advance since considerable lead time may be required.
- Diverting calls to alternate locations can be complex and expensive.
- Diversity across service providers is usually cost prohibitive.
Hosted PBX or hosted VoIP, is where the provider is responsible for housing the IP-PBX as well as handling the technology required to provide the services to the phone system. The desk sets will plug into your network and are connected to the provider’s network.
On-premise PBX is also known as an IP-PBX phone system. It is similar to a traditional PBX system that resides at a location, such as a computer equipment room or phone closet. Calls can go through a traditional phone company as well as voice over Internet (VoIP) using SIP trunking. The provider can be the one that already provides service, though a SIP trunk can be configured for use with an Internet service telephone provider (ISTP).
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