[SIPForum-techwg] Question re Application Server

[Paul Kyzivat]

Klaus Darilion wrote:

>> After I studied the wording of the document more carefully, I realize 
>> that its scope is carefully limited to Enterprise-PSTN interconnect. 
>> With that limited scope, there never would be any direct routing from 
>> Acme to Bozo.
> 
> What about a "real direct routing" - Acme to Bozo without routing via a 
> service provider? IMO that should happen.

That assumes that Acme knows the request should go to Bozo. But this may 
  not be information that is available to Acme. For instance, it may be 
that both Acme and Bozo are customers of the same SP, and that SP keeps 
that information to itself. Or even if it isn't a secret, its one more 
service that Acme might like to outsource to the SP. It might be 
different if there were widespread availability of public ENUM.

This area seems to strongly overlap with Speermint. I guess it really is 
out of scope of SIPConnect, at least for now.

	Paul

> regards
> klaus
> 
>>
>> Conceptually, calls from Acme to Bozo would go via a pair of 
>> application servers connected by a PSTN link. If you collapse that to 
>> IP routing following these rules, you then need the B2BUA to do the 
>> readdressing that the SGWs otherwise do.
>>
>> But realistically doing this without going to the PSTN, and without a 
>> B2BUA, is going to be valuable. IMO the kind of usage I'm showing 
>> above, while out of scope for the current document, can be viewed as a 
>> backward compatible extension to the current document.
>>
>>     Paul
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>