From: "Attila Sipos" <[EMAIL PROTECTED]>

   >   What if you are using something like DNS SRV to route to a
   >   group of gateways?  How can one ensure all new requests go the
   >   same gateway?
   >
   >Why would you want to?

   Maybe I wasn't clear.

   I want all the overlapped dialling related to single call to all go
   to the same gateway.  This is what RFC3578 requires anyway but it
   does this by saying you can only use overlap dialling in the way
   described if "the SIP routing infrastructure ensures that INVITEs
   will only reach one gateway."

   What if you have a pool of PSTM gateways?  For example, you have 1
   gateway at first but you need more capcity.

Yes, I see that's what RFC 3578 says.  But it's clear if you think
about it that the real requirement is "All INVITEs reach one of a set
of gateways/proxies that all have the same policy in regard to which
URIs will receive 484 responses."

And in any situation that makes sense from an engineering point of
view, that latter condition will be true without additional effort in
regard to 484 responses.

So it doesn't seem that you will ever need to expend additional effort
to get 484s to work correctly.

Dale
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