Transcoding

Transcoding is the conversion of audio or video from one codec or bitrate to another, used in mobile networks to bridge incompatible endpoints (e.g. AMR-NB to EVS for VoLTE-to-PSTN), in IMS for media interworking at the IBCF/TrGW, and in OTT services for adaptive streaming. Transcoding can introduce quality loss and adds processing latency.

Categories: Radio Access NetworkThreats and AttacksOperations and Business

Transcoding 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.

Telecom threats range from opportunistic SMS phishing and SIM swap to nation-state grade location tracking. The common thread is that most attacks exploit the inherited trust model of legacy signaling protocols.

To place Transcoding in the wider telecom-security picture, review NAT, A5/0, AMPS, Backhaul, Billing System and BSS — each entry cross-references back to this page so you can walk the topic in either direction.

Related terms

More from the TelcoSec Glossary

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