[Megaco] Re: Event descriptor handling for static logic interfaces like CAS
Thomas.Voith at alcatel.de
Thu Oct 2 03:59:33 EDT 2003
On behalf of Mr Voith
From: Thomas Voith [mailto:Thomas.Voith at alcatel.de]
Sent: 01 October 2003 13:52
To: megaco at ietf.org; tsg16q3 at itu.int
Subject: Event descriptor handling for static logic interfaces like CAS
H.248.26 and in H.248.ICAS I miss a feature, which has been used
already for On-Hook, Off-Hook the 'strict' parameter.
All interfaces, which have static states, should implement such
The problem is that the EventsDescriptor EventBufferDescriptor or an
embedded EventsDescriptor may discard events, if the newly received or
replacing Event Descriptor does not match the event.
In the Megaco Secnarios, always just the good case is shown.
e.g. a static interface with 4 logical incoming events ( S1,S2,S3,S4)
would then set the EventsDescripror like:
MGC guess the MG is in state i1, no Notify will be sent by MG, when
state of interface is still i1.
( Note: in case "state" is the default, then EventsDescriptor could be
The events descriptor remains active, after Notification is sent.
The strict parameter avoids unnecessary Notifications for the already by MGC
This mechanism would be very simple and avoids lost of any events, which is
required for signalling interfaces on MG transferred via H.248 to an MGC.
For a better illustration I have attached a Excel-File containing a simple
So my question/proposal is:
- Is it possible to extend the existing static state interfacepackages like
H.248.26 with this
- If not, can I get this functionality otherwise ?
V | Thomas Voith
+---------------+ | Dept. VS/EAC2 [Systems]
| A L C A T E L | | FL/2/50
| Tel: +49 711 821-40293
| Alcanet: 259-40293
Alcatel SEL AG | Fax: +49 711 821-40211
Fixed Networks Division |
Lorenzstr. 10 | mailto:Thomas.Voith at alcatel.de
D-70435 Stuttgart, Germany |
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