2009/1/12 Iñaki Baz Castillo ibc@aliax.net:
Symbol # is NOT allowed into a SIP URI userinfo part per SIP BNF grammar, so the phone is escaping it before sending the request. This is a correct behavior even if lots of softphones don't escape it.
Also, # symbol is allowed in a TEL URI, but not in a SIP URI userinfo part.