[SIPForum-techwg] SIPconnect/1.1 v03 onlist - section 7 support for registration

[Bernard Aboba]

> Without registration, we would be required to work with each and
> every small business customer to 1) make sure they had a reachable address for
> their PBX, and 2) get the IP address or URL that we would provision into
> the contact fields of their account.

While this is a good argument for why the service provider MUST support REGISTER,
it isn't a good argument for why every PBX must support it. 

REGISTER isn't a reasonable solution for a PBX in a substantial enterprise.  

And yes, that does imply provisioning an IP address or URL for the enterprise customer.