[Users] OpenSER and transport selection (SRV and NAPTR)

[Bogdan-Andrei Iancu]

HI Joachim,

you are right - when the NAPTR support will be added, I plan to cumulate 
all t_relayxxxx() functions in a single one like:
    t_relay("[proto:]host[:port]")

lack of proto or port will trigger NAPTR or SRV lookups.

regards,
bogdan

Joachim Fabini wrote:

>Hi,
>
>Initially I intended to submit a feature request for
>OpenSER functionality similar to t_relay_to_udp, 
>t_relay_to_tcp but WITHOUT the need to specify the 
>destination IP address and port.
>My reasoning was to let the new functions do exactly 
>what t_relay() does but in addition force the DNS SRV 
>query for a specific transport (udp, tcp, or tls). 
>
>Seeing the roadmap for 1.1 I realized that NAPTR solves 
>part of this problem. Is there already any estimation 
>when NAPTR implementation will be available in OpenSER?
>
>I intentionally said "part of the problem" because 
>NAPTR delegates the decision on the transport to the
>destination DNS. But: our own proxy might also be
>required to control the selected transport.
>It seems to me quite flexible to implement a 
>proxy-hosted NAPTR emulation and specify the list 
>of requested protocols, e.g. 
>t_relay_to_transport("tls","tcp",0) 
>specifies that t_relay should firstly generate a 
>SRV DNS query for _sips._tcp.mydomain.org, if this 
>fails to query for _sip._tcp.mydomain.org and then 
>give up - if I don't want UDP. 
>
>This saves one DNS query (NAPTR) and enables a proxy
>to control what protocols it uses for contacting the 
>next hop.
>
>Finally, I believe that the interface to t_relay_naptr() 
>(or whatever the naptr relaying will be called) should 
>support selection of desired protocols, e.g.
>t_relay_to_naptr("tls", "tcp", "udp") where entries
>can be left empty to indicate that this transport is
>not desired. The argument order might even overrule 
>the NAPTR response transport ranking - finally we
>connect and thus decide on what transport we prefer... ;)  
>
>Any comments warmly welcome,
>best regards
>--Joachim
> 
>
>
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