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What Is SIP Trunking?
SIP Trunking line converges voice and data onto one pipe,
providing seamless access between the Internet and the worldwide
PSTN (Public-Switched Telephone Network), resulting in immediate
cost saving.
With SIP Trunking the IP Network provides PSTN connectivity. A
call travels the majority of its path over the network instead
of on the PSTN and then drops back down to the
destination/facility at the last mile. By implementing as a
carrier, traditional local and long distance charges decrease
dramatically because the call travels mostly over the IP network
and not on the PSTN.
There are three components necessary to
successfully deploy SIP trunks: a PBX with a SIP-enabled trunk
side, an enterprise edge device understanding SIP and an
Internet telephony or SIP trunking service provider.
The PBX
In most cases the PBX is an IP-based PBX, communicating with all
endpoints over IP, but it may just as well be a traditional
digital or analog PBX. The sole requirement is that an interface
for SIP trunking connectivity is available.
The enterprise border element
The PBX on the LAN connects to the ITSP via the enterprise
border element. The enterprise edge component can either be a
firewall with complete support for SIP or an edge device
connected to the firewall, handling the traversal of the SIP
traffic.
The ITSP
On the Internet, the ITSP (Internet Telephone Service Provider)
provides connectivity to the PSTN (Public Switched Telephone
Network) for communication with mobile and fixed phones.
While everyone can
agree that a great benefit of
SIP Trunking
is a typical cost that is 40 - 70% below what legacy Telcos can
offer, the features that enhance functionality and scalability
and resolve issues related to large-scale enterprise deployments
are the major features associated with SIP Trunking. Some of the
features of the product line include:
- Unlimited local as well as toll free,
nationwide and international calling
- Inbound call balancing over multiple
locations supports large call centers
- Provides business continuity and
disaster recovery
- Utilize existing equipment
- Eliminates multiple carriers
- PSTN origination/termination
- 24/7 Network Operations Center
- Offers flexible configuration options
- Unleashes the full potential of your
IP PBX
- Operates with legacy CPE through a
simple VoIP gateway to deliver IP benefits to existing PSTN
equipment
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