[asterisk-dev] Unify (Siemens) OpenStage uaCSTA Functionality

[Jonas Köritz]

Hi devs,
I am trying to add some uaCSTA Support to chan_sip and are asking for some
advice as this is the first time I am making changes to asterisks source
code. For now I put a new case into the code for handling incoming NOTIFYs
to handle uaCSTA messages sent by the phone. I am storing the phones status
inside astdb (is this the ideal solution?), per extension. I want asterisk
to handle forwarding and do not disturb for the phone. I can already send
the postive response to the incoming SIP NOTIFY but I have no idea how to
generate a new NOTIFY dialog to inform the phone of any changes (even
actions started by the phone need an event sent to the phone to make it
update its state.)

You may find Documentation for the interface at this address:
http://wiki.unify.com/images/9/96/White_Paper_uaCSTA_for_OpenStage_SIP.pdf

What's your opinion on implementing such functionality inside asterisk? To
me it seems simple to implement.

Regards
Jonas Köritz
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