[Users] draft-anil-sipping-bla-03.txt (bridged line appearance) support

[Alan Crosswell]

Has anybody implemented BLA support using OpenSER and/or other code?  It
appears a State Agent is needed to SUBSCRIBE to the UAs and do all kinds
of fun stuff.  We use Polycom phones which support all this stuff and
are migrating cranky customers from a highly functional legacy PBX that
heavily use all these "business" features.

/a