5.4.1 Phone
The Phone service is one of the basic functions of the intercom: helps you establish
connections with other IP network terminal equipment. The support 2N IP intercoms
the extended SIP and are compatible with and certified by the leading SIP PBX and
terminal equipment manufacturers (CISCO, Avaya, Broadsoft, etc.).
The intercom supports up to five parallel calls: 1 outgoing and up to 4 incoming calls.
Just one of the calls can be – the audio stream is interconnected with the active
microphone and speaker and video stream with the camera. The other calls are always
– the microphone and speaker are muted, the intercom receives the DTMF inactive
characters for the opponent to control the intercom (activate/deactivate profiles,
users, etc.).
Typically, the intercoms are used for outgoing calls and incoming calls are inactive –
the microphone and speaker are muted. However, you can configure your intercom to
make incoming calls active and ringing; refer to the tab. Press the * and # keys Calls
on the numeric keypad to answer and terminate an incoming call.
The use the , , and protocols (with a licence key) 2N IP intercoms G.711 L16 G.722 G.729
to encrypt or compress audio streams and the or codecs to compress H.263 H.264
video streams. Broadband codecs L16 and G.722 are available in selected 2N IP
models only. Choose your preferential codecs in the Audio or Video tab.intercom
Explanation of IP Telephony Terms
SIP – is a phone call signalling transmission protocol (Session Initiation Protocol)
used in IP telephony. It is primarily used for setting up, terminating and
forwarding calls between two SIP devices (the intercom and another IP phone in
this case). SIP devices can establish connections directly with each other (Direct
SIP Call) or, typically, via one or more servers: SIP Proxy and SIP Registrar.
SIP Proxy – is an IP network server responsible for call routing (call transfer to
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