[Sip] info-events and callee capabilities / caller prefs (RFC3840/3841)

[Jeroen van Bemmel <jbemmel at zonnet.nl>]

All,

In analogy with RFC3265-based events and caller prefs / callee 
capabilities, I believe there may be value in having something similar 
for info-events.

Since the current info-events draft does not define a tag for use in 
Supported/Require, a UAC currently has no way to signal that it prefers 
to communicate with a UAS that supports INFO events, let alone  specific 
INFO events (e.g. key strokes, caller ID pictures, etc.). Such a 
capability could be valuable in upgrade scenarios (i.e. moving from a 
network that does not support INFO packages).

My suggestion is therefore to let the new info-events draft update 
RFC3840/RFC3841 with e.g. "info-events=....", and to also define a tag 
for use with Supported/Require to support capability indication

Regards,
Jeroen
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