peter,
i just tested and at least when reg-id and +sip.instance are in contact
header
Contact:
<sip:0x82a0798@192.98.102.10:5052;transport=tcp>;expires=600;+sip.instance="<urn:uuid:447ff092-6236-47d9-bc0a-a3c6856aacf2>";q=0.8;reg-id=1.
of register request, they do get parsed correctly, because they show up
in instance and reg_id fields of location table.
-- juha