5 reasons to use SIP trunking

  • SIP trunks offer cost-saving efficiencies, flexibility, and scalability over traditional TDM.

  • The technology can also provide a solid foundation for UC applications and advanced UC features.

  • SIP lines can be programmed to roll over to other devices or sites, supporting your disaster recovery plans.

Session Initiation Protocol (SIP) trunking is an Internet protocol-based (IP-based) service that can replace services such as ISDN PRI lines and T1 or T3 lines. It is primarily used for making calls on an IP-based network and works with all sorts of devices and applications, including voice calls to soft phones, video and audio conference sessions, and other unified communications (UC) applications.

Here are the five top reasons companies are moving away from traditional time-division multiplexing (TDM) to SIP:

1. Lower cost. While totals will vary widely depending on what service you currently have and the SIP trunk offering you replace it with, you’ll see savings from the efficiencies gained by combining voice and data over the same network. What’s more, while PRI and T1 lines are sold in set increments, such as four, eight or 24 channels, you can order SIP trunks in any size you want. If you’ve got a small branch office that requires only one or two sessions at a time, you can order and pay for a trunk of only that size. And SIP is fully managed, reducing the equipment you may need to handle.

2. Scalability. Should that branch office grow over time, you can add circuits to the SIP trunk, again ordering only as many as you need. No more trying to calculate whether it’s worth moving from a PRI to T1 or T1 to T3.

3. Flexibility. You can also adjust the size of your SIP trunk to accommodate variations in bandwidth requirements, such as to deal with seasonal changes in call volumes. Not only can you can dynamically vary the amount of bandwidth given to any application based on requirements at any time, but you can also easily route traffic depending on volumes.

4. Support for unified communications. SIP is crucial for enabling UC applications, including presence and advanced features, such as the ability to transfer a call from a mobile phone to a laptop-based soft phone. SIP trunks provide the network foundation upon which your firm can deploy such applications.

5. Reliability and disaster recovery. Because they’re IP-based, SIP trunks are far more flexible than traditional fixed circuits like T1 and PRI lines. For example, SIP lines can be programmed so that if a user is out of the office, or an entire office is out of commission, the lines roll over to backup sites, or to devices anywhere on your network or at a backup facility. It’s all based on the business rules you set up.

These are just a few of the reasons SIP trunking is taking off. Learn more about the benefits your business could enjoy with AT&T SIP Trunking with AT&T IP Flexible Reach.

Sybil Fitzpatrick Lead Product Marketing Communications AT&T About Sybil