Idnani Ajaykumar-AIDNANI1 wrote: ...
I had a question about the 'From' and 'To' addresses in SIP, and while I was going through the grammar, I noticed that the grammar allows for a 'From' and 'To' address to NOT have any 'userinfo' in the name-addr spec. Is this really desired? Or was this done so as to accommodate the Request-URI in the same grammar rules? If this was desired, under what circumstances one would have a 'From' or 'To' address with no 'userinfo'. Could you have a 'From' address of 'From: Anonymous <sip:anonymous.invalid>', when the identity of the caller is to be hidden?
It is up to the owner of the domain to assign meaning to the userinfo part. Usually this is pretty important, because there are lots of destinations within the domain that need to be distinguished. But that need not be the case. When the domain identifies a single device, and that device has only a single addressable point within it, then the userinfo portion may be unnecessary.
Its nothing to worry about. Just take the addresses as you get them. When assigning addresses in your own domain you are free to require a userinfo portion if that is what you want.
And yes, <sip:anonymous.invalid> is a perfectly fine From address.
Paul
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