Any ideas on adding credentials to my PSTN gateway?

I would like to not have the password en clear text in my kamailio.cfg but if it's not possible that's OK.

On Fri, Aug 28, 2015 at 9:47 AM, Michael Nielsen <mic.niel84@gmail.com> wrote:
I'm trying to use a PSTN gateway with Kamailio for outbound - and incoming - calls.

Everything seems to be routed correctly, except the PSTN gateway denies the call due to missing authentication.

How do I add credentials for my PSTN gateway in a secure way?

Best regards,
Michael