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Stopping SIP extensions registering with external SIP gateway?

Hi

We are configuring a CME system which has 20 internal DECT phones which are setup as SIP extensions locally and we also have an external SIP provider who gives us 2x SIP extensions.

We have registered these 2 with the external SIP gateway but all our 20+ internal extensions are also trying to register with that gateway and its causing our IP to be blacklisted due to lots of unauthorised attempts.

We have set the internal extensions not to register yet they seem to ignore this and try anyway!

One example:

voice register dn  8
 number 306
 name Guest 4
 no-reg
 label 306

Any ideas?

Thanks

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