Yealink SIP-T41P

Yealink IP Phones Configuring Guide
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4. To end the multicast RTP session, press the multicast paging key again or press the
EndCall soft key.
Note
To send RTP stream via a paging key list when the receiver’s phone is idle:
1. Press the paging list key when the phone is idle.
2. Press or to select the desired group.
3. Press or the Paging soft key to send RTP.
4. To place the current multicast RTP session on hold, press the Hold soft key.
The sender’s phone places the multicast RTP session on hold and receiver’s phone
releases the session.
5. To resume the held multicast RTP session, press the Resume soft key.
The multicast RTP session is established again.
6. To end the multicast RTP session, press the multicast paging key again or press the
EndCall soft key.
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
Multicast RTP is one way only from the sender to the multicast address(es) (receiver). For
outgoing RTP multicasts, all other existing calls on the phone will be placed on hold.