Yealink SIP-T42G - Manual (Page 74)

User Guide for the SIP-T42G IP Phone
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3. Enter the desired line ID in the Account field or leave it blank.
For more information on the valid value of the Account field, refer to Replace Rule
on page 59 .
4. Click Confirm to add the block out number.
Note
Public telephone networks in countries around the world have a single emergency
telephone number (emergency services number), that allows a caller to contact local
emergency services for assistance when necessary. The emergency telephone number
may differ from country to country. It is typically a three-digit number so that it can be
easily remembered and dialed quickly. Some countries have a different emergency
number for each of the different emergency services.
You can specify the emergency telephone numbers on the IP phone for contacting the
emergency services in an emergency situation.
Note
To specify emergency numbers via web user interface:
1. Click on Features->Phone Lock.
Block out number is configurable via web user interface only.
Contact your local phone service provider for available emergency numbers in your
area.