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Your guide to SIP trunks
SIP is shaping up to be a market changing
technology that could set a rocket up
compatible, and for the complete
service resellers can provide
the comms industry some time soon.
support for the installation and
Alan Mackie, Senior Product Manager
ongoing fault management. The
end customer is buying a complete
at Gamma Telecom, discusses the
solution, not a collection of parts.
benefits of SIP trunks and offers a guide
Ensure service provider
for resellers thinking about selling them.
and OEM are joined up
The relationship between the SIP
provider and the SIP equipment
manufacturer is vital to ensure a
A
big benefit of SIP consistent quality of service. As
trunking is number well as the CPE devices being
portability, allowing tested with the SIP provider’s
customers to relocate network, resellers should examine
their office and keep their number. The the relationship that they have.
SIP trunking can benefit any size Are they working together at a
and location of business. It can
complete
marketing, product, technical
support from two concurrent
end-to-end
and sales level to ensure that
calls to no limit on the volume resellers can get the maximum
of concurrent calls. Other
solution must
support on new features and
advantages include number
be supported
any ongoing support issues?
flexibility, supporting DR plans well
Alan Mackie
below ISDN costs, and trouble- Supplier scale is key
free system expansion where an cost in supporting IP services, requires at a consistently good SIP trunking is a business
additional number of SIP channels and improved troubleshooting standard of voice quality. connectivity service and like any
can be added to a site quicker with guaranteed times to fix. connection to the PSTN it must
and cheaper than deploying ISDN. Set expectations provide a highly available and
Another big plus is site resilience, There a number of options in SIP trunking services are an reliable service that will scale
where a SIP trunk installation and a providing SIP trunking solutions to alternative to ISDN, rather than a as SIP trunking moves from this
retained ISDN solution enable the end customers. The best solution like-for-like replacement. SIP can initial market deployment stage
availability of the voice service at is determined by a combination provide a number of advantages to mainstream. The SIP provider
the site to be enhanced without of the features that the customer over ISDN, but a key element is should also provide the basics
the need for major infrastructure. wants, the PBX that the reseller that the service must work and of a telephony service. For
chooses to deploy and the work reliable to be used in a example, emergency services
SIP trunking can facilitate flexible other services that the customer business environment. Therefore calling support; Directory Enquiries
Disaster Recovery solutions. By may require. For example, if the the service must be engineered support; and online number
creating a SIP account for a customer is looking for a voice to be reliable with an effective management and access to CDRs.
customer’s PBX, the telephone and data solution, it may be resilience mechanism in the event
numbers associated with that appropriate to ‘pull back’ all of a failure. SIP trunking is not simply Choose a service version that
account are hosted on the SIP applications from remote sites a cheap alternative to ISDN and fits your skills and expertise
providers’ network. In the event to a single data centre that can should not be positioned as such. There is no one way to provide
of a disaster the account can provide both voice and data SIP trunking services to the
be utilised in another PBX on services. From this site SIP trunking Have the full product telecommunications provider
another site and connected services can then be provided. Resellers should ensure that the channel. Some providers will wish
via an IP connection. Alternatively, if the customer is whole package is fully tested, to deliver the solution using their
only looking for a voice service documented and can be own IP infrastructure or via their
Resellers want total confidence in then a dedicated PBX connection provisioned and supported. The preferred ISP partner, whereas
IP Telephony services before they to a SIP Trunking service on site full supported service package others would like a package
start selling them. For example, may prove a better solution. should include: The IP PBX or SIP that provides and manages the
Gamma offers a ‘joined up’ Gateway that will be installed complete solution to the customer
service, where it takes responsibility Key points for resellers seeking to on the customers site; the router premises, leaving them to focus
for the end-to-end service from succeed in the SIP trunking market: that will be utilised to connect on the support of the PBX.
the Gamma network right through Access is key to the IP Network Provider; the
to the router on the end user’s In order to support SIP access to IP Network, or Internet Service There is no de facto model for
premises. This offers resellers the customer’s site resellers need Provider that will support the voice delivering SIP trunk solutions to a
three key benefits – a more to ensure that the IP connection connections; and the SIP trunking customer. The essential element
defined service with Service Level on site can support the number service provider. All elements is that the complete end-to-end
Agreements, less complexity and of concurrent calls the customer of the overall solution must be solution can be supported.
„
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32 COMMS DEALER MARCH 2009 www.comms-dealer.com
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