For the purposes of the present document, the terms and definitions given in
TR 21.905 and the following apply.
A term defined in the present document takes precedence over the definition of the same term, if any, in
TR 21.905.
Web Real-Time Communications (WebRTC):
A set of browser extensions enabling web applications to define real-time services.
WebRTC IMS Client (WIC):
A WebRTC-capable browser running a JavaScript application that allows a user to access IMS services.
For the purposes of the present document, the following symbols apply:
Cx
Reference Point between a CSCF and an HSS
Gm
Reference Point between a UE and a P CSCF or between an IP-PBX and a P CSCF
Iq
Reference Point between the IMS Application Level Gateway (ALG) (IMS-ALG) and the IMS Access Gateway (IMS-AGW)
Mb
Reference Point between a UE and IP network services used for user data transport
Mw
Reference Point between a CSCF and another CSCF
W1
Reference Point between a WIC and WWSF
W2
Reference Point between a WIC and eP-CSCF
W3
Reference Point between a WIC and eIMS-AGW
For the purposes of the present document, the abbreviations given in
TR 21.905 and the following apply.
An abbreviation defined in the present document takes precedence over the definition of the same abbreviation, if any, in
TR 21.905.
DTLS-SRTP
Datagram Transport Layer Security SRTP
eP-CSCF
P-CSCF enhanced for WebRTC
eIMS-AGW
IMS-AGW enhanced for WebRTC
ICE
Interactive Connectivity Establishment
NAT
Network Address Translation
P-CSCF
Proxy CSCF
RTP
Real-time Transport Protocol
S-CSCF
Serving CSCF
SDP
Session Description Protocol
SIP
Session Initiation Protocol
SRTP
Secure RTP
WebRTC
Web Real-Time Communication
WIC
WebRTC IMS Client
WWSF
WebRTC Web Server Function
WAF
WebRTC Authorization Function