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SIP Trunking and Internet Connections for VoIP

Posted on: June 3, 2019

While speed is often what is talked about when it comes to SIP Trunking, equally as important for V1 VoIP resellers to discuss are circuits. With VoIP, reliability and voice quality are determined by the type and quality of Internet service. Putting VoIP on a best-efforts circuit in turn gives you “best efforts phone quality”. For some businesses that do not heavily rely on their phones to conduct business, DSL or cable is adequate. For critical telephone users, best-efforts probably isn’t good enough.

SIP Trunking on DSL
The bandwidth required for one phone call is 80K while the slowest DSL connection provides 384K upload speed. Simple math would indicate that the circuit would support four simultaneous calls with no room for data. A new type of DSL called ADSL2+, provides for faster upload speeds of up to 1MB. This type of bandwidth would allow for several calls while leaving suitable bandwidth for internet access.

SIP trunking on Cable
Cable companies typically provide service that has several MB’s of upload speed, with plenty of bandwidth for voice and data.

SIP trunking on T1
A T1 has 1.44MB of bandwidth in both directions, so a T1 line could handle up to 19 simultaneous VoIP calls.

Multiple Circuits and Gateways
One way to ensure both data and voice is by having two circuits, one dedicated to voice and the other to data. This way you can forget about having all critical services going through one circuit, with a fast connection such as a cable circuit, and a more reliable, albeit slower circuit for voice. Gateways also utilize having two circuits, with this device allowing the themto do auto-failover. In this instance if your primary data circuit is interrupted, data traffic moves to the primary voice circuit. And the same backup capabilities exist if the voice circuit has problems.

There are many factors to consider when it comes to SIP Trunking service. Speed, quality, as well as circuits, bandwidth and gateways. To discuss your SIP Trunk reselling needs, contact V1 VoIP today.

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