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Some IP Phones provide different ring tones based on call source (internal or external) and there’s text field to enter Alert-Info so that distinctive ring can be used for that destination.

T.38 is an ITU recommendation for allowing transmission of fax over IP networks in real time. Sidpex M200 IP PBX supports T.38 fax pass through.

IAX2 protocol carries both signaling and media on the same port 4569 (by default). SIP signaling port is 5060 (by default), but media goes through other random ports. For IAX2 you only have to make sure port 4569 is clear then the phone calls can be guaranteed, but for SIP, besides port 5060 also other […]

IAX (Inter-Asterisk Exchange) is a communications protocol native to the Asterisk PBX software, and is supported by a few other soft switches, PBX systems, and soft phones. It is used for transporting VoIP telephony sessions between servers and to terminal devices. IAX now most commonly refers to IAX2, the second version of the IAX protocol.

SIP (Session Initiation Protocol) is a signaling communications protocol, widely used for controlling multimedia communication sessions such as voice and video calls over IP networks.

IP Phones are the same thing as VoIP Phones or Soft Phones. These are telephones that use VoIP technologies for making calls over an IP Network or the traditional PSTN networks.

PBX (Private Branch Exchange) is a system that connects telephone extensions of a company to outside public telephone network as well as to mobile networks. An IP (Internet Protocol) PBX is a PBX that provides audio, video, and instant messaging communication through the TCP/IP protocol stacks for its internal network and interconnects its internal network […]

VOIP is an acronym for Voice over Internet Protocol, or in more common terms phone service over the Internet. If you have a reasonable quality Internet connection you can get phone service delivered through your Internet connection instead of from your local phone company.