Re: +sip.instance parameter is missing in 200 OK for REGISTER
Not something straight.
You can try and store that param into usrloc by hand (see attr_avp
get it back to lookup time. But it will be more mission impossible to
add it to the 200OK reply as the Contact hdr in internally built by the
registrar module (so you cannot come with your own changes from the
Looks like some development should be needed to do that.