Elements of A VoIP Phone
- Physical Hardware
- DNS client
- STUN client
- DHCP client (not commonly used)
- Signalling stack (SIP, H.323, Skinny, Skype, or others)
- RTP stack
- Codecs
- Audio
- G.711
- GSM
- iLBC
- Speex
- G.729
- G.722
- G.722.2 (AMR-WB)
- other audio codecs
- Video
- H.263
- H.263+
- H.264
- Audio
- User interface
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