Version 6.2 301 February 2011
SIP User's Manual 8. IP Telephony Capabilities
8.4 General
8.4.1 Event Notification using X-Detect Header
The device supports the sending of notifications to a remote party notifying the occurrence
(or detection) of certain events on the media stream. Event detection and notifications is
performed using the SIP X-Detect message header and only when establishing a SIP
dialog.
For supporting some events, certain device configurations need to be performed. The table
below lists the supported event types (and subtypes) and the corresponding device
configurations, if required:
Table 8-4: Supported X-Detect Event Types
Events Type Subtype Required Configuration
CPT
SIT-NC
SIT-IC
SIT-VC
SIT-RO
Busy
Reorder
Ringtone
beep
SITDetectorEnable = 1
UserDefinedToneDetectorEnable = 1
Notes:
Ensure that the CPT file is configured with the
required tone type.
On beep detection, a SIP INFO message is sent
with type AMD/CPT and subtype beep.
The beep detection must be started using regular
X-detect extension, with AMD or CPT request.
FAX
CED (IsFaxUsed ≠ 0) or (IsFaxUsed = 0, and
FaxTransportMode ≠ 0)
modem VxxModemTransportType = 3
PTT
voice-start
voice-end
EnableDSPIPMDetectors = 1
The device can detect and report the following Special Information Tones (SIT) types from
the PSTN:
SIT-NC (No Circuit found)
SIT-IC (Operator Intercept)
SIT-VC (Vacant Circuit - non-registered number)
SIT-RO (Reorder - System Busy)
There are additional three SIT tones that are detected as one of the above SIT tones:
The NC* SIT tone is detected as NC
The RO* SIT tone is detected as RO
The IO* SIT tone is detected as VC
The device can map these SIT tones to a Q.850 cause and then map them to SIP 5xx/4xx
responses, using the parameters SITQ850Cause, SITQ850CauseForNC,
SITQ850CauseForIC, SITQ850CauseForVC, and SITQ850CauseForRO.
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