[SIPForum-techwg] Comment on example in 10.2.1
john.elwell at siemens-enterprise.com
Thu Apr 9 16:14:40 EDT 2009
During today's call it was suggested that an application for dial string
was where the SP-SSE supports, speed dialling, say, on a per-PBX basis.
So it needs to know which PBX's dial plan the dial string relates to. I
suppose it could also get this based on where the request comes from,
but an explicit indication in the URI sounds desirable.
The question is, whether we want to support PBX-specific dial plans at
Concerning dial plans in general at the SP, they might be needed for
cases where you want to call a special number at the SP, e.g., directory
enquiries. These can't be represented as E.164 numbers. They could, of
course, be represented as "email-style" URIs, e.g., sip:192 at sp.net,
which would be simpler than using the dialstring construct.
> -----Original Message-----
> From: Francois Audet [mailto:audet at nortel.com]
> Sent: 09 April 2009 19:21
> To: Elwell, John; techwg at sipforum.org
> Subject: RE: [SIPForum-techwg] Comment on example in 10.2.1
> I agree, IF the service provider imposes the same prefixes to all it's
> customers (which may not be the case).
> That being said, I still believe that the use of dialsting instead
> on user=phone is problematic and will create issues. I'd rather
> we use user=phone, and have the PBX remove the prefixes, and use
> fully-qualified phone numbers.
> In other words, something like this:
> > -----Original Message-----
> > From: techwg-bounces at sipforum.org
> > [mailto:techwg-bounces at sipforum.org] On Behalf Of Elwell, John
> > Sent: Thursday, April 09, 2009 06:23
> > To: techwg at sipforum.org
> > Subject: [SIPForum-techwg] Comment on example in 10.2.1
> > In 10.2.1 there is an example of a dialstring sent to the
> > SP-SSE in the Request-URI of an INVITE request:
> > "SIP:101066612128901234;phone-context=[Enterprise Domain
> > Name]@ [Service Provider Domain Name];user=dialstring"
> > (Ignoring the incorrect capitalization of sip:), this uses
> > Enterprise Domain Name in phone-context, implying it is the
> > domain name of the enterprise. If it is a dial string
> > relating to the enterprise domain, the enterprise should be
> > able to resolve it and convert to a
> > (non-dialstring) URI.
> > In my opinion, if the SIP-PBX is going to send dial strings
> > to the SP-SSE, it should only send dial strings in the
> > context of the SP's domain. I would propose changing it to:
> > "SIP:101066612128901234;phone-context=[Service Provider
> > Domain Name]@ [Service Provider Domain Name];user=dialstring"
> > John
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