As Daniel mention, try to ngrep or tcpdump if messages are received or not.

Some Phones need to activate an special option to use DNS SRV instead A registers

BR

Alberto

2016-02-22 10:10 GMT+01:00 Daniel Tryba <d.tryba@pocos.nl>:
On Sat, Feb 20, 2016 at 03:08:00AM +0000, Derek Bolichowski wrote:
> I am not able to register any devices to this SRV record.  However I
> /CAN/ register directly to kam1.some-domain.com and
> kam2.some-domain.com
>
> Registration attempts to the DNSSRV Record (kam.some-domain.com) do
> not even appear in /var/log/messages.

This doesn't sound like a kamailio issue. But the only way to start is
to take a look at the network layer, are messages being sent and are
they received on the kamailio host.

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