Yealink SIP-T21 E2 Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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codec as your voice and is audible to conversation partners.
SIP INFO
DTMF digits are transmitted by the SIP INFO messages when the voice stream is established
after a successful SIP 200 OK-ACK message sequence. The SIP INFO message is sent along the
signaling path of the call. The SIP INFO message can transmit DTMF digits in three ways: DTMF,
DTMF-Relay and Telephone-Event.
Procedure
Configuration changes can be performed using the following methods.
Central Provisioning
(Configuration File)
<MAC>.cfg
Configure the method of transmitting DTMF
digit and the payload type.
Parameters:
account.X.dtmf.type
account.X.dtmf.dtmf_payload
account.X.dtmf.info_type
<y0000000000xx>.c
fg
Configure the number of times for the IP
phone to send the end RTP Event packet.
Parameter:
features.dtmf.repetition
Specify how long the phone should play
each DTMF tone for.
Parameter:
features.dtmf.duration
Configure the frequency level of DTMF
digits.
Parameter:
features.dtmf.volume
Specify how long the phone should wait
between DTMF digits.
Parameter:
features.dtmf.min_interval
Web User Interface
Configure the method of transmitting DTMF
digits and the payload type.
Navigate to:
http://<phoneIPAddress>/servlet?p=accou
nt-adv&q=load&acc=0

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English