Hi list,

we operate a commercial PSTN-replacement service.

For my setup we need to restrict the contact-information that the user register with.

Only the assigned E.164 number in "Contact" shall be allowed with a specific "Digest username" in REGISTER

Our contact and digest_username are very similar and only differ by a prefixed '0' in contact.

E.g.

Contact: <sip:0123456@cpe.network:5060;transport=UDP>

Authorization: Digest username="123456", realm="network......

Is it possible to compare these two and only allow registration if the comparison returns true?

Thanks for your help and best regards,

Gerhard

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