[Serusers] Compare "Contact" and "Digest username" in REGISTER

[Gerhard Zweimueller]

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 at 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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