What is SIP Trunking?

SIP Trunking uses Session Initiation Protocol (SIP), a signaling communications protocol commonly used for Voice over IP (VoIP), to deliver voice calls over a data circuit.  Businesses use SIP Trunking to replace existing telephone lines that connect internal phone systems with the Public Switched Telephone Network (PSTN). Rather than using a dedicated circuit for your phone calls, SIP Trunking uses a data connection to carry both voice and data and allows for as many voice calls as bandwidth allows.

 

Benefits of SIP Trunking

Control Costs

Smaller businesses reduce costs by combining voice and internet connections, often combining two or more circuits to a single connection. Larger businesses reduce costs by centralizing all local service from many locations into one or two central SIP Trunking locations.

Improve Flexibility

Concurrent calls can be added or deleted and with Branch Office Extensions are not bound to a physical location.

Reduce Complexity

Smaller businesses reduce complexity by combining voice and internet connections. Larger businesses reduce complexity by centralizing. Troubleshooting, and telephony management also becomes centralized.

Business Continuity and Disaster Recovery

After combining many location’s circuits to a central SIP Trunk, having a redundant path is important to maintain connectivity during failure conditions. You can take advantage of trunk call routing, or other means to re-direct calls near instantly in the event of a disaster.

AT&T IP Flexible Reach

With AT&T SIP trunking services, you can integrate voice and data into one network, and see better utilization of your network capacity.

Find out how

Considerations for Deploying SIP Trunking

Organizations look at the following criteria as they assess a transition to SIP trunking

Number of Phones

The total number of phones you have throughout the enterprise will likely determine the configuration and capacity you require.

Number of SIP Trunks

How many simultaneous calls do you need to handle at your peak call traffic? Think of SIP trunks like concurrent call paths; regardless of how many telephone numbers or Direct Inward Dial numbers (DID’s) you have, your number of SIP trunks will determine how many simultaneous calls you can make at any given time.

Phone System

Routers supporting SIP Trunking can be configured to support many legacy phone systems, as well as newer IP-PBXs.

Optimal Trunk Capacity

If you are using your main internet connection for your SIP trunks, you will want to ensure that your internet bandwidth is large enough to support both your normal daily online usage as well as your call volume.

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