09/07/22 23:40 PM  

Outbound Call Prefix

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This article explains how to configure Outbound Call Prefix.

Outbound Call Prefix (OCP) is an optional feature that lets users know whether they’re dialing an internal extension or an external number. Outbound Call Prefix:

  • Resolves conflicts when an internal extension overlaps with a country’s external number dial plan.
  • Can be used with numbers of any extension length.
  • Can be any digit between 2 and 9.
  • Includes a configuration wizard that resolves any conflicts between existing extensions.
  • Includes the Default Area Code feature for countries that support it (Canada, Mexico, Australia, and China).

Outbound Call Prefix is available for all RingCentral MVP accounts, and is ideal for accounts with more than 1000 users. 

To turn on OCP for your account, contact RingCentral Support.

Configuring Outbound Call Prefix

RingCentral strongly recommends that you use the same OCP setting/digit across all of your linked accounts.

  • If you enable OCP for Linked Account 1 (using the code 9) but disable it for Linked Account 2, no extensions in either account will be able to start with 9.
  • If you enable OCP for two linked accounts (using the code 9 for account 1 and the code 8 for Account 2), no extensions in either account will be able to start with 8 or 9.

To configure OCP for your account(s):

  1. Contact Support to enable OCP on your account. 
  2. Go to the Admin Portal and sign in.
  3. Go to More > Account Settings > Outbound Call Prefix.
  4. Adjust the toggle to turn on Use outgoing call prefix.
  5. Enter the digit that users will need to enter before calling an external number. 
  6. Click Validate & Save.
Note: If there’s an existing extension that begins with the same specified Outbound Call Prefix digit, the Adjust Extensions window will appear. Change the digit again.  
  1. If Site Codes are enabled, you’ll need to change any Site Codes and/or Short Extensions that start with the selected prefix digit.
  2. Phones will reboot when the setting is enabled/updated. Active calls won’t be affected.

Note: In choosing your OCP digit, take care not to pick one that won’t conflict with the numbers for local services in your area.

For example, in Poland, the number for fire services is 998. If you live in Poland and select 9 as your OCP digit, the system will read a call to 998 for an emergency fire response as “OCP digit + the first two digits of an extension.”

Making calls with Outbound Call Prefix

Scenario: Your administrator sets 9 as the Outbound Call Prefix for your account.

Calling within an area code

  • The user is assigned the phone number 1-758-222-2222, and  would like to call 1-758-333-3333.
  • The user dials the number + Outbound Call Prefix: 9-333-3333, and the system inserts the Default Area Code automatically. (Default Area Code is available for phone numbers in Canada, Mexico, Australia, and China.)
  • The number may also be dialed as area code + number: 758-333-3333.

Calling a different area code

  • The user is assigned the phone number 1-650-222-2222, and would like to call 1-305-444-4444.
  • The user dials the area code and number: 305-444-4444. 

Calling a different country

  • The user is assigned the phone number 1-650-222-2222, and would like to call 44-20-5555-5555.
  • The user dials the international dial prefix + country code + area code + number: 011-44-20 5555-5555. 
  • The user can also dial the number in E.164 format: +44-20-5555-5555.

Calling emergency or special services

  • Users can access special in-country services, such as emergency or text relay, with or without the Outbound Call Prefix. For example, in the U.S., a user could dial either 911 or 9-911 to reach emergency services.   


Additional resources


Enterprise Dial Plan, Outbound Call Prefix, dial plan
Outbound Call Prefix
Published Externally
RingCentral MVP
Article Assignment
Article Properties
Jan Michael Jayme
Zed Christian Basilio
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