Administrator’s Guide for SIP-T2xP IP Phones
264
Distinctive ring tones allows certain incoming calls to trigger IP phones to play distinctive
ring tones. The IP phone inspects the INVITE request for an "Alert-Info" header when
receiving an incoming call. If the INVITE request contains an "Alert-Info" header, the IP
phone strips out the URL or keyword parameter and maps it to the appropriate ring
tone.
Note
Alert-Info headers in the following four formats:
Alert-Info: 127.0.0.1/Bellcore-drN (or Alert-Info: Bellcore-drN)
Alert-Info: ringtone-N (or Alert-Info: MyMelodyN)
Alert-Info: <URL>
Alert-Info: info=info text;x-line-id=0
When the Alter-Info header contains the keyword “Bellcore-drN”, the IP phone will
play the Bellcore-drN (N=1, 2, 3, 4 or 5) ring tone if the parameter
“features.alert_info_tone” is set to 1, or play the corresponding local ring tone
(RingN.wav) in about ten seconds if the parameter “features.alert_info_tone” is set
to 0.
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
Pattern
ID
Pattern Cadence
Minimum
Duration
(ms)
Nominal
Duration
(ms)
Maximum
Duration
(ms)
Bellcore-dr1
(standard)
1
Ringing
2s On
1800
2000
2200
Silent
4s Off
3600
4000
4400
Bellcore-dr2
2
Ringing
Long
630
800
1025
Silent
315
400
525
Ringing
Long
630
800
1025
Silent
3475
4000
4400
Bellcore-dr3
3
Ringing
Short
315
400
525
Silent
145
200
525
Ringing
Short
315
400
525
If the caller already exists in the local directory, the ring tone assigned to the caller
should be preferentially played.
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