Snom 220 - Manual (Page 23)

Basic Functions
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a. To map a local SIP line: A user can assign the local lines to
programmable keys by selecting this option and setting the URL of the
local line as argument to that key setting. For example, if a phone has 2
registrations, [email protected] and [email protected], the user has
the option to map two programmable keys to each one of these lines by
selecting 'Line' and setting the respective SIP URL as argument. In this
case, all the calls to a particular line will go to its matching programmable
key, e.g., if [email protected] is mapped at key P2, the LED on that key
will start blinking when there is an incoming call on that line. Similarly, if
the user presses P2 in the idle state, [email protected] will become the
active line for that call. This feature enables the customer to use his
different SIP accounts as he would use different PSTN phone lines. It is
also possible to assign different ringtones to each SIP line in order to
make an acoustic differentiation. This can be done either on the proxy or
on the Settings/SIP/Lines page of the phone web interface.
b. To map a SIP URL for call pickup: Selecting this option with a SIP URL
as argument will subscribe to dialog state changes of the phone with that
registration. The LED on that key will show the status of the registration
as idle, talking, or ringing by varying frequencies of blinking. This allows
the user to pick up a ringing call remotely by simply pressing a key. An
example of its usage would be the mapping of the office reception phone
line to the phone of a secretary. If for some reason a ringing phone is not
answered at the reception, the secretary can see its ringing status by the
blinking LED and pick up the call by pressing that programmable key. This
way, no calls go unanswered.
c. Free Key: 'Line' is also the default setting for the programmable keys. If
no argument is set, the keys are treated as free. Outgoing and incoming
calls not bound to any other key go to the first such free key.
Destination
The user can map a SIP URL to a particular programmable key by
setting this option and providing the URL as argument. This option can
be used in the following ways:
a. If the sip line [email protected] is bound to key P3 with this option, all
calls coming to the phone from this number will go to P3.
b. If, on the other hand, P3 is pressed during the idle state,
[email protected] will be dialed, as it is set as destination for this key.
c. In the ringing state, if the call comes from any line other than
[email protected], pressing P3 will transfer the incoming call to
[email protected].
Intercom
This option is similar to 'Destination' with the exception that pressing
the key bound to 'Intercom' enables the intercom mode and the phone
will be directly connected to the set snom phone if authentication is set
up properly. This feature is useful in an office environment as a quick
access key to connect to the operator or the secretary.