Support dial-out emergency numbers with SIP Bridge

[Antreesy]

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Feature request

Verify and implement support of calling local emergency / short numbers (911, 112, 116117, 103, e.t.c.)

Additional context
General:

• default_phone_region should be supplied in any case
• Emergency centers can ping caller location from the mobile device, how is could done via SIP?
  • E.g. if address of company might be registered, what if user is calling remotely?

Frontend:

• Requires a validation on client:
  • we can migrate from libphonenumber-js to google-libphonenumber to support validating short codes (larger library, but it's already async)

API:

• Check if number is modified in the process

SIP:

• Check if number is modified in the process
  • Quote: "The SIP bridge will call the number as received from Talk - but will evaluate any configured number-prefix or replace-prefixes from its server.conf."