1. A SIP Event Package for DTMF Event Monitoring
IETF 58
A SIP Event Package
for
DTMF Event Monitoring
draft-zebarth-sipping-dtmfad-00.txt
Joe Zebarth, Vice Chair T1S1.7

2. This document:
Was prepared on behalf of Committee T1
Defines A SIP Event Package for DTMF Event Monitoring
Was prepared to support IANA Registration per RFC 3427 (BCP 67) Change Process for the Session Initiation Protocol

3. Event Package "DTMFAD" proposes use of SUBSCRIBE and NOTIFY to collect DTMF digits
to implement:
Committee T1 Technical Report T1.TR
“SIP Network Operators Implementers Guide for
Pre-Paid Calling Card, with DTMF Detection at
the PSTN-IP Gateway”

4. It is recognized that there may be other possible
Usage Scenario
This event package MAY be used to allow an Application server (subscriber) to request DTMF monitoring and notification of detection from a receiving agent (notifier) in order to enable a caller-initiated re-origination request while a call is in progress.
It is recognized that there may be other possible
applications of this event package.

5. This document:
Defines new Event Header Field parameters:
duration
event-set
maxrate
Defines a new MIME type:
application/DTMF-event
Was prepared to support IANA Registration per RFC 3427 (BCP 67) Change Process for the Session Initiation Protocol

6. Characteristics of Event Package
Very Simple
Compact

7. Relationship to KPML Event Package
Less sophisticated
Simpler
Processing intensity at different locations
KMPL package requires processing intensity at the Notifier
DTMFAD package requires processing intensity at the Application Server
Seen as complementary, not competitive

8. This ID be published as an Informational RFC so that
Our desire:
This ID be published as an Informational RFC
so that
IANA registration of this event package
can be obtained

9. Thank You

10. Duration Parameter:
An optional parameter that:
defines the duration of a continuous DTMF tone (in milliseconds) that will cause the notifier to send a NOTIFY request before detecting the end of the tone
If omitted requires event notification to occur only when the end of the DTMF tone is detected
Recommended that this parameter be omitted for normal implementations to reduce messages

11. For this particular usage scenario this parameter may be omitted
Maxrate Parameter:
An optional parameter defining a maximum number of NOTIFY transactions per minute initiated to report DTMF events.
If "maxrate" is omitted, the notifier MUST limit reporting to forty (40) NOTIFY transactions per minute
When defined SHOULD NOT exceed 60.
For this particular usage scenario this parameter may be omitted

12. For this particular usage scenario this parameter may be omitted
Event-set Parameter:
An optional parameter that:
defines the set of events that are to be detected by the notifier
If omitted, it must detect the following set of events:
digits 0 through 9 (decimal 0-9)
the * key (hexadecimal a)
the # key (hexadecimal b); and
special digits A through D (hexadecimal c-f)
For this particular usage scenario this parameter may be omitted

13. Defines a new MIME type: MIME media type name: application
MIME subtype name: DTMF-event
Mandatory parameters: none
Optional parameters: none
Encoding considerations: binary encoding scheme
Notifier shall encode DTMF-event as four octets
| event |E|R| volume | duration |