Spotlight on SIP Trunking Part 1

Posted: March 23, 2011 in Uncategorized
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Today we will discuss SIP Trunking; what it is and what it means to your business. In Part 2 we will focus on When to Implement.

SIP stands for Session Initiation Protocol and was first developed in 1996. In the last few years it has reached a level of sophistication and a price point where it’s a viable solution.

First thing to know is that SIP trunking runs over an IP circuit; T1, DSL, Cable Modem. T1 is the best. Cable Modem offers superior bandwidth but is a shared service and is prone to error messages, sometimes up to 25%. This can cause degregation of voice quality (jitter, latency).

Voice is converted to data and sent along  the same circuit as the other data packets. Data gets the entire bandwidth when no voice is present. Your internet circuit and your circuit providing SIP trunking can be one and the same. Quality of Service (QoS) is managed by the service provider, with voice taking priority over data.

Since SIP Trunking works over IP networks, it potentially eliminates the cost for separate dial tone services like ISDN PRI or multiple analog lines. It also allows businesses to expand their IP reach to remote locations and mobile users.

Some of the benefits of SIP trunking:

  • Cost; typically 30-60% less that standard analog trunks. Long Distance rates are also very competitive.
  • Availability of DID’s (Direct in Dial numbers). You may purchase DID numbers for individuals or departments. Since SIP is an IP-based service, you may even get a DID not associated with your location. For example, if you reside in Chicago but want a St. Louis telephone number, you can have DID numbers local to St. Louis.
  • Features. One of the most popular is Find Me, Follow Me. DID’s ring to your office phone and will forward to your cell phone if not answered. This eliminates the need of listing your cell phone number on your business card. One call does it all.

Remember, SIP is a protocol not a list of applications. Features are provided by the SIP provider and may vary greatly between suppliers. The next time we have a Spotlight on SIP Trunking we will discuss if implementation is a good idea based on your business needs and goals.

  1. harnesssm says:

    WOW! I never knew there was so much to it! Thanks for the posting.

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