[SIPForum-discussion] SIP Call to PSTN Networks

[Maddox, Sean (Practice Principal, TSG Americas)]

James,
 
I was always of the impression that a proxy MAY or MAY NOT require
credentials before accepting or processing a request, meaning that this
is the choice of the implementor.  Paragraph 2 from section 16 of
RFC3261 states:
 
'When a request arrives, an element that can play the role of a proxy
first decides if it needs to respond to the request on its own.  For
instance, the request may be malformed or the element may need
credentials from the client before acting as a proxy.'
 
This is also expanded upon in section 16.3 under item #6 Proxy
Authentication Check with the full details listed in section 22.3.
 
The attached flow chart illustrates this as part of the Request
Validation with the details of section 22.3 omitted.
 
As for whether or not this applies to end-to-end SIP calls or
SIP-to-something_else I believe that depends on the specifics of the
implementation.
 
Thx - Sean
 
Sean P. Maddox <sean.maddox at hp.com <mailto:sean.maddox at hp.com> >
Practice Principal, IP and Unified Communications 
HP Technology Services 
The Hewlett-Packard Company 
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fax: +1 404.648.1014 
sip:sean.maddox at hp.com 

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________________________________

From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org] On Behalf Of Dimitris Makris
Sent: Monday, June 11, 2007 9:38 AM
To: discussion at sipforum.org
Subject: [SIPForum-discussion] SIP Call to PSTN Networks


Hey all,

It is known that registration is NOT required to enable a user agent to
use a proxy server for outgoing calls. I need to know if this feature
applies only to SIP-to-SIP internet calls or in general. For example if
i want to call a PSTN/ISDN endpoint through my sip provider, is it
mandatory to register with him first? 

Thanks in advance.
James Makris






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