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

[Chris Gatch]

I like the idea of saying that the PBX MUST support both operating modes, and the Service Provider MUST support at least one method, preferably both.  We can then provide guidance that says Registration mode is recommended when the PBX has a dynamic IP and static is recommended otherwise.



I reach this idea because it is probably not practical to require all SPs to support static mode b/c the administrative overhead of collecting and provisioning data about customer device IP addresses would be operationally prohibitive at scale.  At the same time, it's not necessary to force them to support registration mode either.  This wouldn't make sense for a service providers targeting large enterprises in environments where the value of registration is minimal.



The negative with this approach is there are undoubtedly a few very large PBXs about which the manufacturer could argue registration is unnecessary overhead b/c their customers won't use that mode.  I can understand this point of view, but I'm left with the reality that something must be required of both PBX and SP SSE to have interoperability.  The brings me right back to needing support for BOTH methods on the PBX to achieve interoperability in the broad sense.



Finally, I think a survey of the PBX space would find a large majority of all SIP capable PBXs already support both modes.



Chris




From: techwg-bounces at sipforum.org [mailto:techwg-bounces at sipforum.org] On Behalf Of Spencer Dawkins
Sent: Wednesday, February 04, 2009 10:28 AM
To: techwg at sipforum.org
Subject: [SIPForum-techwg] SIPconnect/1.1 v03 onlist - section 7 support for registration

(Just a word of administrivia - we had some topics at last Friday's telechat that we said needed to be discussed onlist - I'll be posting a few of these today)

Current text in Section 7 says:

The required support for each mode is shown in Table 1.

Mode

Registration

Static

SIP-PBX

MUST support

MAY support

SP-SSE

MUST support

MUST support


Table 1: Required Support for SIPconnect/1.1 Modes



Spencer: Alan has challenged Registration at MUST level for all SIP-PBXes, regardless of size. His concern makes sense to me. Comments? Need to discuss onlist (did not come to consensus on telechat) on next telechat.


Obviously, we didn't come to agreement on last Friday's telechat, and we've been discussing onlist, but I wanted to put the discussions in terms of the current text.

>From the editor's perspective, what's in question is the MUST for the SIP-PBX to support Registration mode. Our choices are MUST, SHOULD (probably with an escape hatch based on size), and MAY.

What should Table 1 say in this cell?

Thanks,

SPencer
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