Call Analysis SIP Message Details
Call Analysis is performed on a per call basis. The originating endpoint sends a SIP INVITE message to specify whether or not call
analysis should be performed on the outgoing ISDN call. The gateway sends back a SIP INFO message to indicate what was
detected on the line: a live person, answering machine, silence or unknown.
The following call analysis types are supported:
• AMD: voice, answering machine, silence, unknown (configurable timeout)
• CPT: SITTone
• FAX: CED, modem
• PTT: voicebeg, voiceend
The identification of what needs to be detected is specified through an incoming SIP INVITE message and used when establishing
the outgoing side.
The incoming SIP INVITE must notify the gateway application of the desire to detect call analysis events by including the following
header element:
Content-Type: application/cpevent
SDP:
Type= <type detected>\r\n
\r\n
Subtype= <subtype detected>
NOTE: space after the equals (=).
where <type detected> is one of the following:
* AMD
and <subtype detected> is one of the following:
* voice
* answmachine
* silence
* unknown
* CPT
and <subtype detected> is:
* SITTone
* FAX
and <subtype detected> is one of the following:
* CED
* modem
* PTT
and <subtype detected> is one of the following:
* voicebeg
* voiceend
The Gateway will notify the incoming SIP call of the call analysis results using a SIP INFO message (of the form below) sent to the
remote party.
Call Analysis Configuration
PIKA FormulaT1/E1 Gateway 1.0 User Guide
6.4 ISDN Settings Screen
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11/2/2007
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