Natively supported VOIP protocols:

• SIP, Session initiation protocol
• IAX, IAX2 - Inter Asterisk Exchange protocol (open-source trunking protocol primarily used by Asterisk)
• MGCP: Media gateway control protocol, IETF - see Megaco
• H.323 (With the addition of OpenH323 )

There are third-party addons that greatly enhance this list, for example alternative H.323 channels, SCCP/Skinny but also for example OSP.

See also

• Asterisk channels
• Asterisk codecs

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