Tag Archives: sip trunk wholesale

V1 VoIP Explains How SIP Trunking Works

Resellers and wholesale agents tell V1 VoIP all the time that SIP trunks are in high demand from their clients. A major aspect of VoIP technology is SIP and SIP trunking. If you are interested in offering SIP trunking to your clients it is best to have a complete understanding of what they are and what they do. Here V1 VoIP explains the fundamentals of what SIP trunks are and what their capabilities are.

SIP stands for Session Initiation Protocol, and it’s a type of protocol that initiates a session over the Internet. (Protocol is a set of rules governing the format of messages that are exchanged between computers.) SIP Trunks can save an average small business could easily save 50% or much more on their monthly communications bill because they are more cost effective.

A SIP Trunk is Switched, which means incoming calls from the SIP trunk to the IP-PBX is switched to other devices sitting behind the interfacing CPE proxy device. A SIP trunk offers the IP-PBX switched access to a diverse set of PSTN and/or on-net IP termination points via V1 VoIP’s network side of the SIP trunk.

A SIP trunk establishes a pure IP connection. The VoIP trunk can handle the multi-media options of voice, data, video and mobile connections. The circuit-switched hand-off to the public switch telephone network (PSTN) is not needed, which will lower costs. DID (Direct Inward Dialing) numbers can be provided from virtually any location in North America and a large number of other countries. This permits enterprises to establish a “virtual” presence with incoming calls ringing at a centralized facility. Direct SIP trunking to IP PBXs (private branch exchanges) and soft switches means no additional hardware to achieve end-to-end VoIP.

Traditional voice is attached to a physical location, but the flexibility of V1 VoIP’s SIP allows call routing to any IP address worldwide, including home offices and soft phones. V1 SIP Trunks are able to route calls with any variant of DID or 800 numbers to a specific client on the SIP trunk with multiple ENUM termination. This means that the SIP trunk is not limited to a single 800 or DID number, as it is a switched service that the CPE Proxy will finally route in its domain.

The SIP trunk connects with a SIP device at the customer premise that is a proxy device, with one or more user agents logically attached to it. A border controller/firewall is provisioned that allows scalability via manipulation at the level 5 layer (SIP layer). This allows calls to traverse and pass through the enterprise firewall seamlessly, and with no security issues (as is the case with STUN or manual pinhole techniques).

V1 VoIP SIP Trunks include:

* Managed QoS solution
* Ability to work with any PBX and easy integration with gateways or IP-PBX equipment
* Eliminate the need for expensive and un-flexible traditional voice circuits and reduce the need to purchase additional hardware to interface IP voice to the PSTN
* Cheaper long distance on a SIP trunk when compared to traditional rates
* Complete E911 capability
* Disaster recovery options
* CALEA compliant
* Web based telephone number management
* Detailed call accounting – call history and logs

If you have more questions about SIP Trunks, contact a member of the V1 VoIP team for answers about SIP trunking and what it can do for you.

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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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