Media Gateway

A Media Gateway converts media streams between different transports or codecs, for example, between TDM PCM circuits and IP RTP, or between AMR and G.711 codecs in VoLTE-to-PSTN interworking. Media Gateways are controlled by Media Gateway Controllers (MGCF in IMS) using protocols such as H.248/MEGACO or SIP, and require hardening against fraud and DoS.

Categories: Radio Access NetworkSignalingFraud

Media Gateway in context

The radio access network is where mobile devices attach to the operator's infrastructure. Attacks in this layer include IMSI catching, rogue base stations and downgrade attacks; defenses rest on mutual authentication, integrity-protected signaling and Open RAN supply-chain hygiene.

Signaling protocols carry the control-plane messages that set up calls, register subscribers and route SMS. SS7, Diameter, GTP-C and SIP are the four dominant families, and interconnect exposure of any of them is treated by GSMA as top-tier telecom risk.

To place Media Gateway in the wider telecom-security picture, review PBX, 1G, 5G SA, AMF, Base Station (BS) and Billing System — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

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Browse the full TelcoSec Glossary, the Ultimate Guide to Mobile Network Security, or the P1 Arsenal of telecom-security tools.