[asterisk-dev] [Code Review] 4328: res_pjsip: Document transport selection process

[Joshua Colp]

> On Jan. 15, 2015, 8:43 a.m., Olle E Johansson wrote:
> > You write that SRV is done if the URI is not IP. Check that SRV is not done if there's any port in the URI. If there's a port in the URI, the hostname is to be used for A/AAAA lookups. If there's no port, go for NAPTR, then SRV.
> > 
> > As a side note, SRV may change your port address.
> 
> Joshua Colp wrote:
>     I've tweaked the page slightly to include this condition but have not gone further. Specifically because this page is for how a local transport is selected based on the existing code and not the process of target resolution itself. I mentioned target resolution slightly because of the requirement of a "transport" parameter. If DNS work occurs I fully expect another wiki page to be created describing how it works within PJSIP right now, its shortcomings, and ways to overcome them.
> 
> Olle E Johansson wrote:
>     Ok, but what about NAPTR.

NAPTR is not currently supported by PJSIP.


- Joshua


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On Jan. 12, 2015, 1:33 p.m., Joshua Colp wrote:
> 
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> 
> (Updated Jan. 12, 2015, 1:33 p.m.)
> 
> 
> Review request for Asterisk Developers.
> 
> 
> Repository: Asterisk
> 
> 
> Description
> -------
> 
> The transport selection process of PJSIP (and by extension some of our own logic) can be a dark dark thing. To help illuminate what happens I have created a wiki page[1] which goes through (based on the message type) the process by which a transport is chosen and how it can potentially change.
> 
> Stuff to look at:
> 1. Is this detailed enough?
> 2. Can you follow it? If not, how could it be made clearer?
> 3. Are there additional common issues that should be covered?
> 
> [1] https://wiki.asterisk.org/wiki/display/~jcolp/Transport+Selection
> 
> 
> Diffs
> -----
> 
> 
> Diff: https://reviewboard.asterisk.org/r/4328/diff/
> 
> 
> Testing
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> 
> I opened the wiki page. It opened.
> 
> 
> Thanks,
> 
> Joshua Colp
> 
>

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