Yealink SIP-T38G, Administrator'S Manual

Page: 126 / 402

Configuring Basic Features
113
5. Click Confirm to accept the change.
Connected Line Identification Presentation (COLP) allows the IP phone to display the
identity of the callee specified for outgoing calls. The IP phone can display the Dialed
Digits, or the identity in a SIP header (Remote-Party-ID or P-Asserted-Identity) received,
or the identity in the From header carried in the UPDATE message sent by the callee as
described in RFC 4916.
If the callee has existed in the directory, the local name assigned to the callee should be
preferentially displayed.
Procedure
COLP can be configured only using the configuration files.
Configuration File <MAC>.cfg
Configure the presentation of
the callee identity.
For more information, refer to
Connected Line Identification
Presentation
on page 269 .
DTMF (Dual Tone Multi-frequency), better known as touch-tone, is used for
telecommunication signaling over analog telephone lines in the voice-frequency band.
DTMF is the signal sent from the IP phone to the network, which is generated when
pressing the IP phone’s keypad during a call. Each key pressed on the IP phone
generates one sinusoidal tone of two frequencies. One is generated from a high
frequency group and the other from a low frequency group.
The DTMF keypad is laid out in a 4× 4 matrix, with each row representing a low
frequency, and each column representing a high frequency. Pressing a digit key (such
as '1') will generate a sinusoidal tone for each of two frequencies (697 and 1209 hertz
(Hz)).
DTMF Keypad Frequencies:
1209 Hz 1336 Hz 1447 Hz 1633 Hz
697 Hz 1 2 3 A
770 Hz 4 5 6 B
852 Hz 7 8 9 C
941 Hz * 0 # D