Juha Heinanen wrote:

> clients are existing standard sip clients that not given anything else
> but aor, username and password.  then they automatically make srv query
> on example.com, not on x.example.com.  

Most clients are configurable with AOR, default proxy, username, and
password. If they aren't configurable with this, they're broken, they've
always been broken, and you need new ones. Even web browsers can be
configured to use a proxy that is not related to the user's AOR.

Examples of clients configurable this way include my ancient 3Com phone,
ancient Pingtel phone, every version of a Cisco 79xx phone I can
remember using over the last seven years, Linksys PAP2, Linksys RTP31, etc.

Some phones even learn their default proxies via DHCP.

So to do what you want to do, configure two sets of SRV records, one
that will be exercised by phones as "default proxies" and one that
corresponds to the domain part of your AORs.

--
Dean


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