[asterisk-dev] 0015539: [patch] Register requestlinecontainswrong address when domain and registrar host differ

Tue Jan 26 06:36:40 CST 2010

26 jan 2010 kl. 12.34 skrev Nick Lewis:

>> Then go write your own version of the protocol while the rest of us try
> to unite around the standard ;-)
> I will stick to reading the existing standard
> 
> Section 10.2.6
> "If there is no configured registrar address, the UA SHOULD use the host
> part of the address-of-record as the Request-URI" - otherwise use the
> registrar address

> 
> Section 24.1
> "REGISTER sip:registrar.biloxi.com SIP/2.0"
> 
> Also when processing a REGISTER request, the domain identified in the
> Request-URI "registrar.biloxi.com" is "biloxi.com" so there is no
> contradiction with section 10.3
I don't get that example, it's against all I've seen anywhere else. You got me there.
You can't say that "biloxi.com" is the domain, it could very well be "registrar.biloxi.com" - only DNS will tell. If we have NAPTR or SRV records, then it's a domain. If not, it's a host.

This is funny, after all years of SIP trainings I still learn new things. This was deeply hidden, but you are right.
If we have a known REGISTRAR the registrar is in the R-URI, otherwise it's the domain part. This is, as you say, hidden in 10.2.6.

Is this implemented in any phones out there? I haven't seen it for sure. Must test.

So in order to implement this right, we need a new setting for the REGISTRAR, something we haven't got at this time. Let's forget the syntax of the register= line and get this properly done in type=service.

We also need to check that the domain support in Asterisk supports this. It might be a bug there that we need to fix in all versions from 1.4 and up.

Now, it doesn't say it, but I guess that the registrar address is not limited to host names that has A or AAAA records in DNS - a service that can be located with DNS NAPTR/SRV too. I just see the term "registrar address" and since it's a URI I presume that the normal rules are valid.

Thanks for being persistent and beating my head on this topic!

/O

> 
> N_L
> 
> -----Original Message-----
> From: asterisk-dev-bounces at lists.digium.com
> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Olle E.
> Johansson
> Sent: 26 January 2010 11:06
> To: Asterisk Developers Mailing List
> Subject: Re: [asterisk-dev] 0015539: [patch] Register
> requestlinecontainswrong address when domain and registrar host differ
> 
> 
> 26 jan 2010 kl. 11.59 skrev Nick Lewis:
> 
>> I beg to differ. The r-uri is the registrar host. 
> 
> Then go write your own version of the protocol while the rest of us try
> to unite around the standard ;-)
> 
> Section 10.2 - Constructing the REGISTER request.
> 
> "Request-URI : The Request-URI names the domain of the location service
> for which the registration
> is meant (for example, sip:chicago.com). The userinfo and "@" components
> of the SIP URI
> MUST NOT be present."
> 
> 
> Section 10.3 - Processing REGISTER requests:
> 
> "When receiving a REGISTER request, a registrar follows these steps:
> 1. The registrar inspects theRequest-URI to determine whether it has
> access to bindings for the domain
> identified in theRequest-URI . If not, and if the server also acts as a
> proxy server, the server SHOULD
> forward the request to the addressed domain, following the general
> behavior for proxying messages
> described in Section 16."
> 
> /O
> 
>> 
>> -----Original Message-----
>> From: asterisk-dev-bounces at lists.digium.com
>> [mailto:asterisk-dev-bounces at lists.digium.com] On Behalf Of Olle E.
>> Johansson
>> Sent: 26 January 2010 10:54
>> To: Asterisk Developers Mailing List
>> Subject: Re: [asterisk-dev] 0015539: [patch] Register request
>> linecontainswrong address when domain and registrar host differ
>> 
>> 
>> 26 jan 2010 kl. 11.45 skrev Nick Lewis:
>> 
>>>> If you check the commit, there's a reference to issue #12474 where
>>> you'll find the rest of the info...
>>> apols now read the issue and still not clear why you think Finnish
>>> service is correct to expect the domain in the request line. I think
>>> RFC3261 is clear on this matter, for example the register string
>>> register=bob at biloxi.com@registrar.biloxi.com should result in the sip
>>> message
>>> 
>>>     REGISTER sip:registrar.biloxi.com SIP/2.0
>>>     To: Bob <sip:bob at biloxi.com>
>>>     From: Bob <sip:bob at biloxi.com>;tag=456248
>> 
>> You always register to a domain, not a host. The r-uri is the domain
> you
>> are registering to, not the hostname.
>> 
>> /O
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> _____________________________________________________________________
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> Disclaimer of Liability
> ATL Telecom Ltd shall not be held liable for any improper or incorrect use of the  information described and/or contained herein and assumes no responsibility for anyones use  of the information. In no event shall ATL Telecom Ltd be liable for any direct, indirect,  incidental, special, exemplary, or consequential damages (including, but not limited to,  procurement or substitute goods or services; loss of use, data, or profits; or business  interruption) however caused and on any theory of liability, whether in contract, strict  liability, or tort (including negligence or otherwise) arising in any way out of the use of  this system, even if advised of the possibility of such damage.
> 
> Registered Office: ATL Telecom Ltd, Fountain Lane, St. Mellons Cardiff, CF3 0FB
> Registered in Wales Number 4335781
> 
> All goods and services supplied by ATL Telecom Ltd are supplied subject to ATL Telecom Ltd standard terms and conditions, available upon request.
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