#81 GRUU support

http://www.ietf.org/internet-drafts/draft-ietf-sip-gruu-14.txt

Support in OpenSER for both GRUUs which hide the underlying AoR and which don't. For non-hiding, simply support for the gr=xyz parameter is enough. For hiding, an alias-type database lookup would suffice.

[Olle E. Johansson]

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Any devices out there that supports GRUU? What about interoperability?