Re: francois' comments and why RFC4474 not used in the field

> Seriously: You want the protocol to change, you have to have 
> a reason  
> that makes sense in the context of the Internet. Crazy stuff that  
> people are doing in private networks to justify their financial  
> exchange doesn't qualify as a reason to change accepted Internet  
> architecture.

Here is an Internet architecture with SIP transit service providers.  The
bubble in the middle is "The Internet", enterprises are on the left and the
four service providers are on the right:

Enterprise A ---- { -------- } --+
                  {          }    \
                  {          }     { SP-A }
                  {          }    /
                  {   +----- } --+
                  {   |      }
                  {   +----- } --+
                  {          }    \
                  {          }     { transit-A }
                  {          }    /
                  {   +----- } --+
                  {   |      }
                  {   +----- } --+
                  {          }    \
                  {          }     { transit-B }
                  {          }    /
                  {   +----- } --+
                  {   |      }
                  {   +----- } --+
                  {          }    \
                  {          }     { SP-B }
                  {          }    /
Enterprise B ---- { -------- } --+        


And it should be realized that call forwarding turns any SP into a transit
provider.

-d

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