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SIP Trunks

Nu-TEL communications has helped many companies implement SIP trunk on the Avaya IP Office all over the country. Some installations with ITSP/Telcos include:

Verizon – Level 3 – Cablevision/Optimum – CBeyond – AT&T – NexVortex – and a host of 3rd Party ISPs

What is SIP Trunking?

In simple terms, a SIP (Session Initiation Protocol) Trunk is a Voice over IP technology that allows a SIP enabled phone system such as the Avaya IP Office to make phone calls using an ITSP (Internet Telephony Service Provider). SIP Trunks are now being provided by both major telephone companies and smaller 3rd party players in a variety of different ways.  Hopefully this page will help you understand the capabilities and delivery methods used by SIP trunks and their providers so you can determine if it is the right technology for your company.

How do I get a SIP Trunk?

First you need to have a SIP enabled phone system such as the Avaya IP Office. While it is true that a SIP trunk can be brought into your company and then converted to a technology that your existing phone system can handle, to fully realize the benefits of a SIP trunk it needs to be connected directly to the phone system.

SIP trunks are delivered in two ways to your phone system:

  Over the internet.  This is from a 3rd party ITSP that can either send a box out to do the SIP handling or by opening ports on your firewall to send the SIP trunk to your phone system.  Remember, your voice and that of your caller’s is being converted to data packets and sent over the internet.  With this type of SIP trunk, the is no guaranty that the packets will arrive to their destination in a timely fashion and could cause audio issues.  Having said that, this is an accepted and growing way to make use of SIP.

  With the internet.  This is an total solution engineered by your ITSP to deliver internet and SIP trunks together.  By using this method, voice quality is guaranteed and both pieces of the solution are managed by the same provider.  This is the preferred method of implementing SIP trunks.  Most top tier telephone and cable companies offer this type of solution.

What are the benefits of going with a SIP trunk over a traditional services such as POTS or PRI?

The benefits fall in three areas:

Cost – Generally the monthly recurring charges are less that a traditional trunk and per minute rates are less expensive.  Many companies with allow you to prepay minutes and use them when needed.  This makes SIP a great backup solution as well.  Also you only need to subscribe to as many voice paths as needed but still get all the feature of the trunk.
Features – DID service is available with SIP trunks.  Outgoing Caller ID can be controlled on a more granular level and If making use of mobile twinning on the Avaya IP Office, many ITSPs will allow you to forward the original caller’s Caller ID to your cell phone.
Troubleshooting Problems – Because SIP is an IP technology, the Avaya IP Office has many tools that can be used to troubleshoot and correct issues with SIP trunks.  At the very least, the problem can be quickly identified and the ITSP can be involved if necessary.