Yealink SIP-T21 E2 Administrator's Guide

Configuring Audio Features
829
Bellcore Tone
Pattern
ID
Pattern
Cade
nce
Minimum
Duration
(ms)
Nominal
Duration
(ms)
Maximum
Duration
(ms)
Bellcore-dr3
3
Ringing
Short
315
400
525
Silent
145
200
525
Ringing
Short
315
400
525
Silent
145
200
525
Ringing
Long
630
800
1025
Silent
2975
4000
4400
Bellcore-dr4
4
Ringing
Short
200
300
525
Silent
145
200
525
Ringing
Long
800
1000
1100
Silent
145
200
525
Ringing
Short
200
300
525
Silent
2975
4000
4400
Bellcore-dr5
5
Ringing
450
500
550
Note
2) Alert-Info: ringtone-N (or Alert-Info: MyMelodyN)
When the Alter-Info header contains the keyword “ringtone-N” or “MyMolodyN”, the IP phone
will play the corresponding local ring tone (RingN.wav), or play the first local ring tone
(Ring1.wav) in about 10 seconds if “N” is greater than 10 or less than 1.
Examples:
Alert-Info: ringtone-2
Alert-Info: ringtone-2;x-line-id=1
Alert-Info: <http://10.1.0.31>;info=ringtone-2
Alert-Info: <http://127.0.0.1/ringtone-2>
Alert-Info: MyMelody2
Alert-Info: MyMelody2;x-line-id=1
Alert-Info: <http://10.1.0.31>;x-line-id=0;info=MyMelody2
If the user is waiting for a call, “Bellcore-dr5” is a ring splash tone that reminds the user that the
DND or Always Call Forward feature is enabled on the server side.

Yealink SIP-T21 E2 Specifications

General

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