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.
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