Internally-generated URI user-parts are allocated according to this
scheme:

	~~xx~arbitrary

where "xx" is a two-letter code specifying the sipX facility that is
responsible for allocating the user-part, and "arbitrary" is an
arbitrary string allocated by the facility (within the valid syntax
for SIP URI user-parts).

External and user-driven URI allocation methods are forbidden to
allocate URIs (within the domains that sipX is authoritative for) that
begin with "~~".

The assigned facility codes are:

*** gr

GRUUs and similar URIs.

	~~gr~xxxxxxxxxxxxxxxx
		Where "xxxxxxxxxxxxxxxx" is a 64-bit hex number
		generated by GRUU assignment.

*** mh

The music-on-hold source.

	~~mh~
		The default music-on-hold source.  In the standard
		configuration, it is sip:moh@(domain):5120.

Create file to record the "facility codes" used in internally-generated URI user-parts.
Create file to record the "facility codes" used in
internally-generated URI user-parts.

http://track.sipfoundry.org/browse/XRR-124


git-svn-id: f26ccc5efe72c2bd8e1c40f599fe313f2692e4de@8190 a612230a-c5fa-0310-af8b-88eea846685b
