IP PBX VOIP FAQ
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SIP Trunking Frequently Asked Questions
What is a SIP Trunk?
A SIP Trunk is primarily a concurrent call that is routed over the IP backbone
of a carrier using VoIP technology. SIP Trunks are used in conjunction with an
IP-PBX and are thought of as replacements for traditional PRI or analog
circuits. The popularity of SIP Trunks is due primarily to the cost savings of
SIP along with the increased reliability as backed by the SLAs of SIP Trunk
Providers.
What are the advantages of SIP Trunks over Analog Circuits?
SIP Trunks are cheaper than analog circuits while maintaining the same service
quality that businesses expect from line quality. SIP Trunks cost approximately
$20 to $25 per trunk versus approximately $40 per analog circuit. In addition,
long distance termination charges associated with SIP Trunks are much cheaper
than traditional analog or TDM rates.
What are the advantages of SIP Trunks over PRIs?
SIP Trunks realize their primary benefit over PRIs from cost savings. SIP trunks
typically cost $20 to $25 per trunk for unlimited inbound and local calling
along with a long distance rate that can be under 2 cents per call. When coupled
with line oversubscription (e.g. a 30 person company purchasing just as many SIP
trunks as they anticipate having concurrent calls....typically 8 to 10) SIP
Trunks are a very cost effective way for a business to save money. Lastly, a
primary benefit of SIP Trunks over PRIs is that SIP Trunks can be purchased in
increments of 1, whereas PRIs have to be purchased in increments of 23 channels.
When should a business use a SIP Trunk instead of hosted?
A business should look into purchasing SIP Trunks when they decide that their
needs are best met with a premise based system. This system is often referred to
as an IP-PBX. Coupled with SIP Trunks, an IP-PBX serves up similar features to
hosted solutions. SIP Trunks typically save a business customer money over a
hosted solution in that a SIP Trunk can serve the needs of three to four
employees (depending on oversubscription) while a hosted seat is used for each
employee.
What equipment do I need for my SIP Trunk?
SIP Trunks can work with a SIP ready PBX.
Will I need more Internet Connectivity when I buy SIP Trunks?
SIP Trunks are virtual circuits delivered over an Internet Access line.
Depending on the amount of SIP Trunks purchased, and the amount of excess
Internet connectivity, a business should consider purchasing more Internet
Access. However, it's important to know that when a SIP Trunk is not being used,
the bandwidth otherwise allocated to a SIP Trunk is freed up for use in less
intensive applications such as e-mail and general web use. This dynamic
allocation of bandwidth is yet another feature of SIP Trunks versus more
traditional technologies such as analog or PRI circuits.
Where Can I purchase a SIP Trunk?
Click Here for a list of SIP Trunk Providers
Click here for more information on IP PBX Systems and VOIP phones.