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Megaco H.248
Megaco H.248 over port 2945 uses ASN.1 binary encoding to facilitate signaling commands for multimedia gateway control. It enables communication between call control elements and media gateways, supporting various media types within large VoIP and multimedia networks. It plays a vital role in managing complex media streaming and telephony services across distributed networks..
The Megaco (H.248) protocol is a standardized signaling protocol used in Voice over Internet Protocol (VoIP) and multimedia communications. It facilitates communication between a Media Gateway Controller (call agent) and Media Gateways that handle media conversion between circuit-switched networks and packet-switched networks. Port 2945 is allocated for the binary encoding of Megaco messages using ASN.1, which provides a compact and efficient data representation.
Megaco enables endpoints or media streams to be created, modified, and deleted dynamically, supporting a wide range of signaling scenarios including multimedia conferencing, VoIP calls, and interactive media services. It supports control over media stream functions such as codec selection, echo cancellation, and tone generation. The use of ASN.1 enhances interoperability among heterogeneous systems by adhering to ITU-T and IETF standards.
This protocol operates primarily over UDP on port 2945, though some implementations may use TCP or SCTP for increased reliability. However, official assignments primarily stipulate UDP use. Megaco is inherently scalable, designed for environments such as carrier-grade switching networks, large enterprise telephony, and IP multimedia subsystems where managing media gateways is necessary.