August 2012 – Ed.1.2
EQUITEL – E451 Technical manual
Page 3
1.1.2.
SIP mode with PBX
E451 intercom incorporates a SIP agent that allows sending and receiving calls directly from an IP phone
using the SIP protocol
(2)
through a PBX, should the equipment have been configured to work in this mode.
A controller is optional in this mode, although by using one it would be possible to supervise the calls
established through the SIP protocol, in order to register them.
1.1.3.
P2P-SIP mode
This mode is similar to the previous one. However, in this case we can use the SIP protocol without the
need of a PBX, using “peer-to-peer” (P2P) strategies to initiate sessions.
We must take into account that the supervision control performed by a PBX is lost (expiry time,
forwarding calls, etc)
Should the auxiliary input or output be used, it is necessary a control software to remotely manage the
E451 intercom input or output, regardless the working mode chosen for the audio communication.
1.1.4.
E451 intercom block diagram
Figure 2.
E451 block diagram
E451 intercom contains both the electronic board and the interface passive elements with the user:
microphone, loudspeaker, user button and status LED.
(2) SIP is a protocol for establishing communications, defined in the RCF 3261 standard, and quite employed nowadays in IP telephony systems.
ATTENTION!
