Tag Archives: sip trunk bandwidth

SIP Trunking and Internet Connections for VoIP

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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Easy Reseller Guide to V1 VoIP SIP Trunking

SIP Trunking has become one of the most requested services by V1 VoIP resellers. For those looking to get into the market, here is an easy guide to the underlying technology of SIP Trunking, including what goes into creating a SIP trunking service, and why you should be offering it to your customers.

What Exactly is SIP Trunking?
SIP trunking replaces analog and PRI phone lines because it is the VoIP connection used with a customer’s PBX for making calls. V1 VoIP SIP Trunking is usually much less expensive than traditional landlines and has an incredible amount of features.

The Elements of SIP Trunking
Softswitch
This is a central device in a telecommunications network which connects telephone calls from one phone line to another, across a legacy telecommunication network or the public Internet, entirely by means of software running on a general-purpose computer system.

Bandwidth
SIP trunking requires proper Internet bandwidth at the softswitch location and across the entire Internet network. Quality providers have multiple ISP’s and use major internet backbone carriers.

Contact V1 VoIP today to learn how we can provide a more reliable and cost-effective solution to your business than the large national companies.

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SIP Trunking and Simultaneous Calls

Now that you have access to V1 VoIP’s SIP trunk services, you will need to determine the number of SIP trunks you will need is calculating your trunk requirements. To do this you will need to know your call volume and your bandwidth.

1. What is your call volume?
Call volume is the amount of both inbound and outbound calls made at the same time. If you are not running call monitoring trafficking software, have an assistant or receptionist keep track of the amount of inbound calls during the week. Have them monitor if one day is busier than another or a specific time of day? It is more important to know an approximate number of calls than to say one trunk for every four employees. For outbound calls, estimate how many employees are originating calls (versus answering incoming calls) during a busy hour and how long they are on the phone.

2. How much bandwidth do I need?
Once you understand your call volume needs, then you can determine the bandwidth you will need for your SIP trunks. You don’t want to waste bandwidth you don’t need. Most businesses new to SIP trunking have an inclination to either be super stingy with their bandwidth and hope the connection is clear enough for the company needs or to over-design for the highest clarity. V1 VoIP recommends to use approximately 20% additional bandwidth to be available to cover administrative traffic, control and signaling.

Do you have questions about your SIP trunk needs and how many simultaneous calls you will be able to pass? Contact V1 VoIP or sign up now for answers to your questions.

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