[Freeswitch-users] Best practices question about SIP registration

[Steven Schoch]

On Tue, Jan 8, 2013 at 1:56 PM, Lawrence Conroy <lconroy at insensate.co.uk>wrote:

> Hi there,
>  at the risk of butting in on someone else's party ...
> Nope; your interpretations is NOT best practice.
>

This party is open to all.  I appreciate these answers, and as usual I have
noticed that the fastest way to learn is to do it wrong, and then have
somebody correct me!  Thanks!


> With SIP (see RFC 3263), you do a lookup on the SRV record (at
> _sip._udp.<sipdomain>) to find the machine that handles SIP
> registrations/incalls for the domain. That also gives you the port on
> which that machine is listening.
>

For example, I did a lookup:

$ dig SRV _sip._udp.sip.flowroute.com.

This returns:

_sip._udp.sip.flowroute.com. 43200 IN   SRV     20 10 5060
sip-ca1.flowroute.com.
_sip._udp.sip.flowroute.com. 43200 IN   SRV     10 10 5060
sip-nv1.flowroute.com.



> (Yup, you can also have a NAPTR record in the domain to tell you where the
> SRV record is, but many folks don't bother -- for Best Practice, you
> should, but ...)
>

$ dig NAPTR sip.flowroute.com

sip.flowroute.com.      42818   IN      NAPTR   100 10 "s" "SIP+D2U" ""
_sip._udp.sip.flowroute.com.
sip.flowroute.com.      42818   IN      NAPTR   102 20 "s" "SIP+D2U" ""
_sip._tcp.sip.flowroute.com.

I found that _sip._tcp.sip.flowroute.com does not have a SRV record.  I
don't know what that means.  The RFC says that you should use "SIP+D2T" for
TCP.

Now, as this relates to the Polycom phone example, there are these fields:

    reg.1.address="1000 at fs.domain.local"
    reg.1.auth.userId="1000"
    reg.1.server.1.address="10.10.10.11"
    reg.1.server.1.port="5060"

Since this is a VoIP phone that loads its configuration from the server,
not VoIP software that is configured by the user, it really only needs the
IP address, so the server address field is kind of moot.

But the example domain here is "fs.domain.local".  Why not just
"domain.local"?  Why didn't Flowroute use "flowroute.com" instead of "
sip.flowroute.com"?

And my other question was how is the address "1000 at fs.domain.local" used?
 Does FreeSwitch use that or does it just use the auth.userId?

-- 
Steve
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