[sr-dev] about contact params

i noticed that if i add ;alias param to contact header that does not surround its contact uri in <>s like this: Contact: sip:foo@bar;alias=value then some sip entities interpret ;alias as header param rather than uri param. so i went and added <>s if they are not present resulting to this: Contact: <sip:foo@bar;alias=value> i have tried to figure out from rfc3261 what kind of param ;alias is in the first example, but have not found the answer. looks like it is unspecified in rfc3261. any comments on this? -- juha