Yealink SIP-T2XP Administrator's Manual page 148

Administrator's Guide for SIP-T2xP and SIP-T19P IP Phones
Alert-Info headers in the following two formats:
Alert-Info: http://localIP/Bellcore-drN
Alert-Info: <URL>;info=info text;x-line-id=0
If the Alter-Info header contains the keyword "Bellcore-drN", the IP phone will play

the Bellcore-drN ring tone (N=1, 2, 3, 4 or 5) (if the parameter
"features.alert_info_tone" is set to 1).
Example:
Alert-Info: http://127.0.0.1/Bellcore-dr1
The following table identifies the different Bellcore ring tone patterns and
cadences (These ring tones are designed for the BroadWorks server).
Bellcore
Tone
Bellcore-dr1
(standard)
Bellcore-dr2
Bellcore-dr3
Bellcore-dr4
Bellcore-dr5
Note
"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.
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Pattern
Pattern Cadence
ID
Ringing 2s On
1
Silent 4s Off
Ringing Long
Silent
2
Ringing Long
Silent
Ringing Short
Silent
Ringing Short
3
Silent
Ringing Long
Silent
Ringing Short
Silent
Ringing Long
4
Silent
Ringing Short
Silent
5 Ringing
Minimum Nominal
Duration Duration
(ms) (ms)
1800 2000
3600 4000
630 800
315 400
630 800
3475 4000
315 400
145 200
315 400
145 200
630 800
2975 4000
200 300
145 200
800 1000
145 200
200 300
2975 4000
450 500
Maximum
Duration
(ms)
2200
4400
1025
525
1025
4400
525
525
525
525
1025
4400
525
525
1100
525
525
4400
550