Nonce generation may be seeded by time as an input component, as many pseudorandom values are.

However, the only way to get two servers to truly generate the same nonce, setting a common preshared secret is the only way:

https://kamailio.org/docs/modules/5.6.x/modules/auth.html#auth.p.secret

-- Alex

On Mar 16, 2023, at 10:11 AM, Benoit Panizzon benoit.panizzon@imp.ch wrote:

Hi

We have two registrars.

Today I observed a CPE doing this:

CPE REGISTER (no auth) => Registrar 1 => 407 Challenge NONCE A

CPE REGISTER (auth to NONCE A => Registrar 2 => 407 Challenge NONCE B

CPE REGISTER (auth to NONCE B => Registrar 1 => 407 Challenge NONCE A

and so on.

Time on both registrars is in sync (I tought NONCE was based on time)

Is there a way to sync the NONCE so that both would accept authentication based on the same NONCE?

Mit freundlichen Grüssen

-Benoît Panizzon-

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