SUA :Query on Routing Indicator(Section 3.10.2.1 )

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Newsgroups gmane.ietf.sigtran
Message-ID <[email protected]>
Hi Brian,
     When routing indicator value is 4 that means route on 
     SSN ( mandatory ) + IP Address (optional).

     However, Address indicator Bits only say  whether GT, PC or SSN are
present 
     or not. How do we ensure whether IP address is present or not?

    Will it not suitable if IP address is mandatory and SSN is optional?

    (Because Hostname is mandatory and SSN is optional for Routing
indicator = 3.)

Regards,
Partha.
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