H.323 gateway interfaces support the NFAS (Non-Facility Associated Signaling) feature, while MGCP gateways do not. The NFAS feature allows one Q.931 D channel in a PRI to carry voice signaling for up ...
Several critical vulnerabilities have been discovered in voice over Internet Protocol (VoIP) and videoconferencing products based on the H.323 protocol that’s used in IP telephony applications to ...
H.323 gateways using the call preservation feature of IOS 12.4 (9T) do not have this limitation. I recommend H.323 as a gateway protocol for remote branch offices due to this MGCP limitation.
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