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STUN Servers

What is STUN? A STUN (Session Traversal of User Datagram Protocol [UDP] Through Network Address Translators [NATs]) server allows NAT clients (i.e. IP Phones behind a firewall) to setup phone calls to a VoIP provider hosted outside of the local network. What does a STUN server do? The STUN server allows clients to find out their public address, the type of NAT they are behind and the Internet s...
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VoIP to replace ISDN

After nearly 25 years of continuous service, ISDN channels are finally coming to their end of days. As more and more businesses migrate away from ISDN technologies we explore the reasons for the decline and the replacements on offer to businesses in more detail. So what is ISDN? ISDN stands for integrated services digital networks. It is a standard developed to cover a range of mediums like voi...
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History of VoIP (Short Version)

History of VoIP Voice over Internet Protocol (VoIP) transmission began in 1973 as a result of the experimental Network Voice Protocol invented for the ARPANET. However, it wasn’t until 1995 that the first Internet Phone Software – Vocaltec – appeared. Vocaltec brought to market the first internet phone software called the Internet Phone. The Vocaltec software compressed the voice signal, translat...
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The History of VoIP (Full Version)

The History of VoIP Voice over Internet Protocol, abbreviated VoIP, is a fairly recent technology. It goes by many names, including Voice Over Broadband (VoBB), Internet Telephony, IP Telephony, and broadband phone.The advent of the Internet brought with it an abundance of innovation regarding communication. Of course, there was email in the beginning, but then people started wondering whether th...
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What is MoIP?

Mobile communications over IP. MoIP, or mobile communications over internet protocol, is the mobilization of peer-to-peer communications including chat and talk using internet protocol via standard mobile communications applications including 3G, GPRS, Wi-Fias well as Wimax. Unlike mobile VoIP, MoIP is not a VoIP program made accessible from mobile phones or a switchboard application using VoIP i...
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How PSTN and ISDN switch off will impact your business

How PSTN and ISDN switch off will impact your business. As we all know, in 2015 BT announced that they will be switching off the PSTN and ISDN networks by 2025. With this, BT will no longer accept any new orders or amendments to services applicable to any ISDN products from 2020. Once the switch-off has taken place, customers will be migrated to the IPEX (IP Exchange) core network using SIP (S...
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SIP Response Codes Session Initiation Protocol

SIP (Session Initiation Protocol) is a signaling application layer protocol designed to create, modify, and terminate a multimedia session over the Internet Protocol. It is the most common protocol used in VoIP technology. In SIP, every network element is identified by a SIP URI (Uniform Resource Identifier) which is like an address. They are broken down as 1xx Provisional Responses, 2xx Successfu...
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Resolve one-way audio issues with Port Forwarding for VoIP/SIP

Using Port Forwarding for VoIP to overcome NAT issues. Port forwarding, sometimes referred to as tunneling, is a method of opening a port or ports in a router or firewall to allow communication from a party outside the network.  Port forwarding is the act of actually forwarding a network port from one network node to another.  This enables an external source  to reach a port inside the private LA...
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