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SIP Response Codes Session Initiation Protocol

SIP (Session Initiation Protocol) is a signalling 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 Successf...
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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 tunnelling, is a method of opening a port or ports in a router or firewall to allow communication from a party outside the network.Ā Ā Port forwarding is the act of actually forwarding a network port from one network node to another.Ā  This enables an external source to reach a port inside the private LAN...
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What is VoIP/SIP Call Termination?

SIP/VoIP Call Termination, what is it and how does it work! VoIP call termination is used to refer to the procedures that are used for routing telephone calls from one provider to the next provider until the call has been routed to the last telephone company and has been received by the recipient. Voice termination is another term that is used for call termination. The telephone companies are als...
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Which VoIP/SIP Codec Should You Use?

How To Describe the Quality of a SIP Trunking Call ā€œSo clear, you can hear a pin drop!ā€ Are you old enough to remember the very successful tag line for Sprint Communications' long distance service back in the ancient 1990ā€™s? ā€œCan you hear me now?ā€ Or...Did you grow up remembering the equally (if not more) successful phraseĀ that Verizon Wireless made part of our cultural reality in the new mi...
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20 Free VoIP/SIP Softphones

QuteCom Previously known as WengoPhone, Qutecom is a free, SIP compatible VoIP softphone initially developed by Wengo. QuteCom supports a range of VoIP codecs including G.729, G.711, iLBC, G.722 (wideband) and Speex. H.263 for video is also supported. XLite from Counterpath A very popular, free SIP softphone supporting a range of codecs and also offering great support for desktop business video...
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