Presentation L6

Textual session description: media lines, codecs (rtpmap/fmtp), ICE candidates, and direction attributes. Carried in SIP, WebRTC, and MGC…

64 kb/s PCM audio codecs for telephony: μ-law (PCMU, North America/Japan) and A-law (PCMA, elsewhere) compress linear samples with logari…

Secure RTP/RTCP with encryption and authentication, keyed from SDES, DTLS-SRTP, or MIKEY. A rollover counter (ROC) and key derivation pro…

RTP payload format for named telephone events such as DTMF digits, replacing unreliable in-band tones. Event, end bit, volume, and durati…

Real-time fax over IP using UDPTL or RTP to carry T.30 facsimile phases across packet networks. Gateways translate between PSTN fax modem…

H.323 multimedia control protocol for capability exchange, master/slave determination, and logical channel open/close. Fast Start and H.2…

Transport Layer Security provides a record layer and handshake for confidentiality and integrity on TCP apps. Certificates, AEAD ciphers,…

Datagram Transport Layer Security adapts TLS to unreliable transports with retransmission, explicit sequence numbers, and record epochs. …

Protocol Buffers — language-neutral binary serialization with tagged fields and disciplined schema evolution. Default encoding for gRPC r…