AudioCodes Media Pack MP-11x, User Manual

Page: 297 / 650

Version 6.6 297 MP-11x & MP-124
User's Manual 25. Configuring Supplementary Services
25.14 Out-of-Band Digit Notifications According to KPML
The device supports Out-of-Band digit notifications according to a subset of the KPML
specification (RFC 4730). When an INVITE dialog is initiated, even in early dialog, the
device may receive a SUBSCRIBE message outside of the dialog. An application that
wants to collect digits creates an application/kpml-xml document with the digit
patterns of interest to the application and places this document in a SUBSCRIBE request.
This SUBSCRIBE includes the identifiers of the INVITE dialog. The SUBSCRIBE request
consists of DRegex (Digit Regular Expression). Once a subscription is established, the
device sends application/kpml-rxml documents in NOTIFY requests once a
match is found.
If the SUBSCRIBE request has no KPML body, any KPML document running on that dialog
and addressed by the event id, if present, immediately terminates. However, the
SUBSCRIBE-initiated dialog is still active. If the dialog referenced by the KPML
subscription does not exist, the device returns a 404 Not Found response to the
SUBSCRIBE and terminates the dialog.
It's possible to “re-subscribe”. In such a scenario, the device terminates the existing KPML
request and replaces it with the new request.
Notes:
•
Only one KPML subscription per participant/dialog is supported.
•
Only one regex per pattern is supported.
•
Only single-digit patterns are supported.
•
The following tags are not supported: "pre", "flush", "stream", and "enterkey".