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Re: [Sipping] SIP support for IN services
Jonathan Rosenberg wrote:
[...]
> I would suggest something like:
Jonathan:
Some feedback on your suggestion:
> This mechanism provides a way for SIP elements to make use of
> IN services defined within the PSTN. It does not represent a
> general model for providing of services within SIP.
This is fine -- there are several models for providing service in SIP;
this happens to a specific model that can be used when interworking
with the PSTN.
> The approach has several drawbacks. It is limited to providing
> only services defined within the context of IN (many of which can
> be implemented within SIP without usage of IN techniques).
This I don't agree with, IMHO. The prior example of using ENUM to
resolve a 800 number does not fit an IN service, in my mind anyway.
ENUM operates in the Internet; a DNS server is consulted, not a
PSTN data repository, for instance. The approach outlined in the
I-D has the advantage that the data being accessed is in the PSTN
domain and is accessed transparently from the Internet. While not
technically impossible, why duplicate the all the 800 number databases
in the Internet if we can access them transparently from the PSTN?
> It is limited to services associated with calls
> (presence and IM have no role). It will generally require SIP elements
> to act as B2BUAs, which introduces fault tolerance, scale, and service
> transparency issues.
The travails of a B2BUA are well documented in the SIP/SIPPING WG
email lists. I am neither condoning nor endangering its use. I
simply list it as a possible SIP entity where certain services can
be provided, without saying that an implementor MUST use a B2BUA.
Thanks,
- vijay
--
Vijay K. Gurbani vkg@{lucent.com,research.bell-labs.com,acm.org}
Wireless Networks Group/Internet Software and eServices
Lucent Technologies/Bell Labs Innovations, 2000 Lucent Lane, Rm 6G-440
Naperville, Illinois 60566 Voice: +1 630 224 0216
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