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Blog Posts

V1 VoIP Explains SIP Trunking for Resellers

Posted on: August 28, 2017

For V1 VoIP resellers, SIP trunking is quickly becoming a go-to product to offer businesses from small to enterprise as it can save them up to 70% over traditional phone line usage. SIP trunking is completely replacing traditional and analog phone lines, instead combiming voice and data over a single circuit.

SIP stands for Session Initiation Protocol and is a “signaling” system for connecting, monitoring and disconnecting connections across the internet. A SIP Trunk is a network interface device that recognizes SIP signals and can process these signals to other SIP devices. SIP Trunking is provided by a Softswitch or SBC-Session Border Controller which provides, among other things, signal processing, protocol conversion, transcoding conversion, call routing, QoS-Quality of Service, AAA-Authorization, Authentication and Accounting functions as well as switching control interface to and from gateways.

SIP is a telephony signaling protocol that is used to establish a “communications session or connection” such as a telephone call, IM-Instant Message, conference call or other type of communications on an IP-Internet Protocol network. SIP is a request-response protocol that operates like a “communications browser” protocol such as HTTP-Hypertext Transfer Protocol. SIP is the communications equivalent to such internet protocols such as HTTP and SMTP-Simple Mail Transfer Protocol (SMTP).

Calls placed over the Internet are placed via a media gateway on the service provider’s network. SIP Trunking will work with old key systems or new IP PBXs, offering advanced VoIP features. Unlike PRI lines which contain 23 channels, SIP Trunking can be purchased in increments as low as one concurrent call, so businesses buy only what they need as they need it.

In an IP and traditional telephony network, for a voice call to take place, it is expected that the two telephones go through two different phases known as call setup and call processing. The call setup – the first phase – happens when the two telephones want to talk to each other. This phase takes charge of exchanging all the information needed to get these two phones through and can start the call. In call setup phase, SIP has gradually replaced the well-known H323 is widely used. When the call has been setup, the call processing phase will begin to transfer voice data back and forth between the two phones.

Offer SIP Trunking services to your business clients today. Contact V1 VoIP about our SIP reseller offerings.

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