On 11 Jul 2018, at 17:11, Daniel-Constantin Mierla <miconda@gmail.com> wrote:
is the 'expires' value in the db records greater than 0? It is shown 0 in the rpc dump.

Yes, that was it.

After setting the expires field to 360 and the reg_delay to 3, kamailio sent the REGISTER messages to the auth proxy:

7(9339) DEBUG: tm [uac.c:427]: t_uac_prepare(): next_hop=<sip:172.16.176.129:5080>

So now the uac module has successfully registered with the remote proxy.

Many thanks for you help, very much appreciated :-)

Ben