[Sip-implementors] Private SIP extensions

[Henning Schulzrinne]

I'm trying to get a feel for what kind of "private" (proprietary) SIP 
extensions are currently implemented in commercial products, i.e., 
protocol features that are not documented in either RFCs or late-stage 
working group I-Ds.

Any pointers are most appreciated. I'll be happy to report back to the 
list, but to avoid bothering everyone, please send them to me directly.

Regards,
Henning
Schulzrinne
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