I'm using outbound with gruu enabled and with edge proxy, registrar and auth
proxy all running as separate entities. My problem is once a dialog is
formed between two UAs, if one side re-registers and gets assigned a new
flow token, all subsequent in-dialog messages cannot be routed because the
flow token in the Route set is no longer valid. 

What is the proper way to update the binding?

I read in this  thread
that "using GRUU means that Outbound is also used, so the 
Contact has a +sip.instance and reg-id params which are inspected by 
the registrar to create/update/delete a binding". How is the binding updated

Any help would be appreciated.

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