Introduction
Commend SIP Series
4
2.0/0612
Introduction
Commend Security for the World of SIP
SIP Stations with Intercom Power
The full duplex capable stations of the SIP Series links the world of SIP technology with the reliability
and quality of solutions by Commend,
The stations are connected directly to the Ethernet (LAN/WAN) and in this manner are connected to a
compatible SIP Server via the IP-network. The built-in switch with downlink function allows direct con-
nection of an additional IP-device (e.g. an IP-camera).
Besides high volume, the SIP stations provide a numerous amount of further features: Pre-recorded
audio can be applied in a multipurpose manner, e.g. as acoustic indication at line fault or as waiting
information at call initiation, a configurable background noise canceller provides a crystal clear
communication in challenging situations. Furthermore, the stations are perfectly suited for use as door
stations at entry- and gateways, due to integrated relay outputs.
The robust construction of the SIP Series provides full protection against water, dirt and dust – protec-
tion class IP 65. Each button can be allocated to a call number and the relevant label area can be filled
in individually.
Speech Connection according SIP Standard
The speech connection is established via Voice over IP (VoIP) according the SIP standard over the con-
nected Ethernet LAN, whether with assistance of a SIP capable PBX, of a SIP provider or via dialling an
IP address directly.
Note:
The several versions of the SIP Series are described on
page 10
.
W
HAT
IS
SIP
?
The network protocol SIP is only one among many protocols which are used for VoIP; the “Session Ini-
tiation Protocol” establishes the conversation.
This means, SIP is only signalling the conversation. After that, the Session Description Protocol (SDP) ne-
gotiates the conversation modalities: audio codec and transmission protocol. The latter is responsible for
the actual data exchange.
The actual data stream, i.e. the coded speech, is transmitted via the Realtime Transport Protocol (RTP).
This protocol dismantles the audio data into packets and is sending them over UDP – i.e. the User Data-
gram Protocol (UDP) is responsible for the transmission of the data packets.
SIP Series P
SIP Series V
SIP Series VE
SIP Series F
SIP Series M
