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CCXML: Message on Hold

From: Petr Kuba <kuba@optimsys.cz>
Date: Fri, 18 Sep 2009 14:40:47 +0200
Message-ID: <4AB37FCF.103@optimsys.cz>
To: www-voice@w3.org

We need to implement Message on Hold service in CCXML which will use SIP 
PBX instead of VXML dialog for playing music.

Scenario for this service in SIP is described for instance here:

The problem is that CCXML specification does not provide support for 
this operation. I've noticed that early version of the specification 
contained tag <hold> but later it was removed.

Therefore it will be necessary to use some platform-specific (and thus 
non-standard) extensions. Since we are trying to follow the 
specification as much as possible we are looking for a solution that
breaks the specification as little as possible.

To the best of our knowledge, the only part of the CCXML specification 
that could be related to this problem is at the end of Section 10.2.1:

"The PROGRESSING and ALERTING states have reflexive transitions. This is 
intended to model protocols which have additional states at these 
points, and which MAY exchange messages such as PROCEEDING, ALERTING, 
FACILITY, or NOTIFY. Platforms MAY choose to implement additional states 
which MAY be reflected in the substate property of the Connection 
object. Additional messages can be implemented with <send>."

Our idea is to use the substate property of the Connection object to 
identify that a connection is on hold.

To place a connection on hold and take it off hold we can probably use 
the <send> tag and send events (commands) to and from a connection. This 
would give us also flexibility for similar tasks in future.

Unfortunately, sending events to and from a connection is mentioned only 
in the quotation above. We would appreciate more detailed description of 
this issue.

We would also appreciate any comments on the suggested solution. Does 
this solution make sense? Do we miss something? Does anybody have better 
idea how to implement this? Has anybody implemented something like this?

Thanks for responses,
Petr Kuba

    Petr Kuba, Project Manager
    OptimSys, s.r.o
    Tel: +420 541 143 065
    Fax: +420 541 143 066
Received on Friday, 18 September 2009 12:41:43 UTC

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