2N IP series User Manual

Configuration manual for 2N IP intercoms
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5.3 Calling
Calling is one of the basic functions of the intercom: helps you establish connections with other
IP network terminal equipment. The2N IPintercomssupport 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active– the audio stream is interconnected with the microphone and speaker
and video stream with the camera. The other calls are alwaysinactive– the microphone and
speaker are muted, the intercom receives the DTMF 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 5.3.1 Obecné nastavení. Press the * and # keys on the
numeric keypad to answer and terminate an incoming call.
The2N IPintercomsuse theG.711,L16,G.722andG.729protocols to encrypt or compress
audio streams and theH.263orH.264codecs to compress video streams. Broadband codecs
L16 and G.722 are available in selected2N IPintercommodels only.Choose your preferential
codecs in the Audio or Video tab.
Explanation of IP Telephony Terms
SIP(Session Initiation Protocol)– is a phone call signalling transmission 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 another
entity closer to the destination). There can be one or more SIP Proxy units between the
users.
SIP Registrar–is an IP network server responsible for user registration in a certain
network section. As a rule, SIP device registration is necessary for a user to be accessible
to the others on a certain phone number. SIP Registrar and SIP Proxy are often installed on
one and the same server.
RTP(Real-Time Transport Protocol)– is a protocol defining the standard packet format
for audio and video transmission in IP networks.2N IPintercom uses the RTP for audio
and video stream transmission during a call. The stream parameters (port numbers,
protocols and codecs) are defined and negotiated via the SDP (Session Description
Protocol).
The2NIPintercoms support three ways of SIP signalling:

2N IP series Specifications

General

Category	Intercom System
Network Interface	10/100 Mbps Ethernet
Connectivity	Ethernet
Integration	SIP
Ingress Protection	IP54
Operating Voltage	12V DC
Audio Codec	G.711
Supported Protocols	SIP, RTSP, HTTP, HTTPS
Supported Languages	Multiple