August 2012 – Ed.1.2
EQUITEL – E451 Technical manual
Page 15
However, optionally it can be added a controller to this network (see Figure 11), consisting on a computer
running the appropriate software. It is possible to use a demo application supplied by EQUITEL. In the working
mode with SIP protocol, it just supervises the established calls in order to register them and controls the auxiliary
outputs and inputs. (see points 1.9 and 1.10 ).
3.2.1.
SIP network basic configuration with PBX
The procedure to configure the network using E451 units and SIP mode with a PBX is as follows:
1.
Configure the PBX so as to register as many extensions as E451 units and telephones you wish to
use.
2.
Configure the telephones so that they may be registered in the PBX with the assigned extension.
It is very important the used telephones to have the capacity of using the audio codec G711-A,
which is the one used by E451 intercoms.
3.
Configure the E451 units so that they may be registered as well in the PBX with the extension
assigned to each one.
4.
In each E451, configure the extension of the number to which the intercom will call when
pressing the external button. The call can be forwarded to another telephone (should E451 not
answer it) by configuring the PBX.
5.
When all the units are configured, we must verify that all the units are actually registered in the
PBX and thus they are capable of communicating.
As we will see in the following chapters, the user button has a triple functionality:
call
,
answer and hung
up
.
3.2.2.
Sending a call
When the user button is activated and E451 is correctly registered in the PBX, begins the communication
establishment by using the SIP protocol:
1.
If the device to which it is desired to call (telephone, E451…) is registered, available and accepts
the same audio codification as E451, the latter begins to play the prerecorded message “
calling
tone
”,
which indicates “call received at destination”. It remains like that till the receiver answers
or the waiting time configured in the PBX has expired. The status LED will blink at the same time
the tone is being played.
2.
Should E451 or the destination telephone not be registered, or if a problem with the
communication has occurred (the destination is busy; the audio communication is not
compatible), or if the waiting time for accepting the call has expired, the “offline tone”
prerecorded message will be played twice, indicating “destination not available” and the LED
will turn off.
3.
Simultaneous to this process of communication establishment, and if there is a controller
correctly connected to the network, E451 sends TCP messages indicating the facts that are
taking place: send call request, “DEMCALLSIP”, call request to the destination indicated in the
message, “OUTCALLRINGING”.
4.
If, for whatever the reason, E451 emits the “
offline tone
” message, it informs the controller of
the failure to the communication establishment with the message “DISCONNECTEDCALL”.
3.2.3.
Call reception
Any of the SIP telephones can communicate with any of the E451 units, and any E451 unit can
communicate with another E451, as long as they are correctly registered in the PBX. Simply by calling the
corresponding extension (in the case of the telephone) or by configuring the receiver’s extension in the
E451 that makes the call:
