# \#external-system
**URL:** https://community.auth0.com/tag/external-system/229.md
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## [Store Auth0 User Reference to External DB](https://community.auth0.com/t/store-auth0-user-reference-to-external-db/57497)
**Author:** [@damand](https://community.auth0.com/u/damand)\
**Replies:** 1\
**Last updated:** [February 8, 2021, 3:31pm UTC](https://community.auth0.com/t/store-auth0-user-reference-to-external-db/57497 "2021-02-08T15:31:53Z")
Hello, I want to store the user reference once the user validates their email. So when a user clicks on the validation link in their email, I wanted to create a reference of that user to my external DB, like Auth0 ID or…
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## [Use LDAP queries to get information from Auth0?](https://community.auth0.com/t/use-ldap-queries-to-get-information-from-auth0/6432)
**Author:** [@ashaver](https://community.auth0.com/u/ashaver)\
**Replies:** 1\
**Last updated:** [May 2, 2017, 1:19am UTC](https://community.auth0.com/t/use-ldap-queries-to-get-information-from-auth0/6432 "2017-05-02T01:19:49Z")
Is there a method to use LDAP queries to get information out of Auth0? I’ve read about the APIs (such as the management API and the authorization extension’s API), but I have a use case where another service we use expec…
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## [Hooks to Provision a SIP ID](https://community.auth0.com/t/hooks-to-provision-a-sip-id/6131)
**Author:** [@embabista](https://community.auth0.com/u/embabista)\
**Replies:** 1\
**Last updated:** [April 6, 2017, 12:02pm UTC](https://community.auth0.com/t/hooks-to-provision-a-sip-id/6131 "2017-04-06T12:02:31Z")
Hi I’m fairly new to this so apologies that I might be confused with hooks. Is it possible that upon registration. An API is called by auth0 to my VOIP server to create a sip id for the user and automatically associate t…