I must not understand what you are asking, because it doesn't seem to
make any sense to me.
Are you asking how to find a local proxy, through which to forward
requests to a service you already have a URI for?
Why are you sending *fake* REGISTER requests?
You do mention 3G, which may be causing confusion because IMS has its
own rules for doing SIP which are at best a strange dialect of SIP. If
you are trying to decide between using IMS and not using IMS then I can
see how you might have some difficulty. But if you are just using 3G as
an IP service, then it might not provide any special issues.
Paul
Pascal Maugeri wrote:
> Hi
>
> I need to find the local address to be used on my host to access to a SIP
> service. May host may have for instance an IP address for LAN and another
> one for 3G.
> Of course I know the address of the distant registrar and proxy.
>
> What I do currently is to scan all the available addresses, and build a
> "fake" REGISTER packet, then send it to the registrar, and expect a response
> to make a decision.
>
> Is there a better way to do that ? Can I send a SIP INFO packet for instance
> before being registered ?
>
> Best regard,
> Pascal
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>
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