Add Signal to the list of instant messaging providers
Is your feature request related to a problem? Please describe.
By now it is not possible to indicate Signal profile which a contact uses.
Describe the solution you'd like
Please, extend the list of instant messaging providers by adding a new field to indicate Signal profile, and the handler which may process calls. Therefore a user may click over the number of his/her contact it and the signal app to be launched to make a call if installed.

Describe alternatives you've considered
The main big alternative is to let a user to add own instant messaging providers in the config.php file.
Additional context
Please, consider the possibility to let a user to modify, enable/disable instant messaging providers.
Hi. I believe Signal uses the phone number. Or is there a dedicated account for signal?
Hi. I believe Signal uses the phone number. Or is there a dedicated account for signal?
Sure, it uses it. However, a user may use a special phone number specifically for Signal, and secondly, I am about the handler which launches the signal app installed on a PC, if any.
The handler should allow a user to select the app and the action: call or chat, in most cases.
Hi. I believe Signal uses the phone number. Or is there a dedicated account for signal?
Signal also now provides discovery by id. Please add Signal to the list of instant messengers.
https://signal.org/blog/phone-number-privacy-usernames/
https://github.com/nextcloud/contacts/blob/5102763ec90d0c2e2ee0662d03de28952909740a/src/models/rfcProps.js#L211
fair point. I'll create a pull request to add Signal to the list. Looking at the title of this issue, it should be solved by that. Feel free to open it again (or the duplicate issue referenced above) in case you want to go further with the integration.