What are the different VoIP protocols supported by ATA 186?

A. The ATA 186, when loaded with specific software releases, can support these VoIP protocols: • H.323 v2 & v4 • SIP (RFC 2543 bis) • MGCP 1.0 (RFC 2705), MGCP 1.0/network-based call signaling (NCS) 1.0 Profile and MGCP 0. More.

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