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VoIP Spec 彙整 李思銳 email@example.com
Codec G.711 G.723.1 G.729 G.726 G.727 PCM16
GSM iLBC AMR MP3
VAD and CNG Silence Compression VAD: Voice Activity Detection CNG: Conform Noise Generation 1. transparent through voice 2. RTP payload type: 13 or 19
CLIP CLIP: Caller ID Presentation Bellcore, ETSI FSK, DTMF Pre-Ringing, First Ringing Polarity Reverse
DTMF DTMF: Dual Tone Multi-Frequency 0, 1, …, 9, *, #, A, B, C, D Silence Gap Transfer Mode 1. inband 2. RFC 2833 3. SIP INFO
Jitter Buffer Static or Dynamic Optimal for delay Optimal for quality
AEC Echo Canceller G.165 G.168 Length (? ms)
CPT Call Progress Tone Dial Tone, Ringback Tone, Busy Tone, Warning Tone, Call Waiting Tone Frequency and Cadence
FAX T.38 G.711 pass-trou FAX / Modem Tone
Gain Mute In Gain Out Gain Auto Adjust
Flash Key Duration 300ms 600ms
Ptime Packetization Time, Sampling Rate G.723.1: 30ms G.711/G.729: 10ms, 20ms
Early Media Interactive Voice Response CRBT: Color Ring Back Tone Distinctive Ringing 180 Ringing / 183 Call Progress
SMS SMS over PSTN SMS over SIP
DND and Forwarding Do Not Disturb Busy Forward No Answer Forward Unconditional Forward
Transfer Unattended Attended Instant Messaging Blind Transfer
Hold Call Hold Consultation Hold Semi-Consultation Hold MOH: Music on Hold
3-way Conference Local Third Party is Added Third Party Joins
Call Waiting Call Waiting Tone Call Waiting with Caller ID Call Waiting Pickup
CLIR and COLR CLIR: Calling Line ID Restriction COLR: Connected Line ID Restriction Call Accept Call Block Call Transfer/Forwarding
Other Call Functions Call Following Me Call Park Call Pickup Automatic Call Return
NAT Traversal STUN: Simple Traversal of UDP over NATs TURN: Traversal Using Relay NAT UPNP: Universal Plug and Play ALG: Application Layer Gateway Outbound Proxy
Dialing Plan Min Digits, Max Digits Terminal Digit Start Timeout, Short Timeout, Long Timeout Full Match, Partial Match
Prefix Remove, Prefix Add Trail Remove, Trail Add Speed Dial Phone Book Hot Line
QoS ToS Diff-Serv VLAN Tag
Multi-Homming with SIP Server Master and Alterative SIP Server Dialing Plan
Auto-Provision HTTP / FTP / TFTP Zero Configuration TR-069
User Interface LCD / Button Web CLI: Command Line Interface
Management SNMP: Simple Network Management Protocol CDR: Call Detail Records Status Report: 1. Registrar Status 2. Line Status
Others Session Modification: SIP re-invite (Remote) syslog Debug / Trace Message SIP with TLS support SRTP SIP / H.323 / MGCP / Megaco Integration
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