Cisco ISDN GW 3241 Instrukcja Użytkownika Strona 13

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Video conferencing today
7
Session Initiation Protocol (SIP) is a newer protocol, and an alternative to H.323. It is a simple signaling
protocol for Internet conferencing and telephony. SIP messages have a text format similar to HTTP, making
it more suited to Internet applications and easier to implement in software. However, it is not yet as
popular as H.323.
A number of networking and telephony standards can be involved: for example, ISDN, LAN, WAN,
Internet, ADSL (Asynchronous Digital Subscriber Lines) and VPN (Virtual Private Networks) are the
popular transport media used in desktop video conferencing.
Where necessary, these protocols are discussed in more detail later in the guide.
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