Users can contact external Skype for Business users

You can let people that are using Skype for Business contact Skype for Business users from outside your organization and add them to their list of Skype for Business contacts. After they add them to their contact list, they can see if they are online and IM with them, hold meetings and share desktops.

Before you enable this, you must first Setup Skype for Business Online.

Hey also, here's a Guided Walkthrough (GWT) and a video that might help you out.

Note: For your users to contact Skype for Business users in another organization, you MUST also have the admin in the other organization also enable this setting and add your organization's domain to the Allowed list.

If you are looking to let your Users contact Skype users.

Which version of the admin center do you see?

Illustration of the Office 365 Admin Center. Find out more about the Office 365 admin center

If you see this, follow the steps: To let users contact Skype for Business users in another organizations using the classic admin center

Illustration of the Office 365 Preview Admin Center. Find out more about the Office 365 Preview admin center

If you see this, follow the steps: To let users contact Skype for Business users in another organization using admin center preview

Note: We're still working on the admin center preview. You can switch back to the admin center if a setting or task you need isn't yet available in preview.

To let users contact Skype for Business users in another organization using admin center preview

Let all of your users to contact Skype for Business users in another organization
  1. Sign in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center > Settings.

  3. Under Services and add-ins > Skype for Business and it opens the Skype for Business page.

  4. On Skype for Business page, under External sharing tap or toggle Let people in your organization use Skype for Business to contact people in other organizations to On.

    After you enable it, you need to chose whether you want to allow all domains, allow all domains, then block some from communicating with your organization or allow only specific domains to communicate with your organization.

  5. After you enable it, you need to chose whether you want to allow all domains, then block some from communicating with your organization or allow only specific domains to communicate with your organization.

    Note: Although it depends on your organization, it's recommended that you use the All domains are block except setting and add the partner organization's domain to the list.

    • If you want to allow ALL domains, click None. All domains are allowed.

    • If you want to allow some domains, but block others, click Block these domains and enter the name of names of the domains that you don't want your organization to communicate with.

    • If you only want to allow specific domains, click All domains are block except then add the name of the organization's domain that you want to communicate with.

    Note: When you enter domains, you will need to separate each domain you enter with a comma.

  6. Click Save.

Let a user contact Skype for Business users in another organization
  1. After you enable it for your organization above, you should verify that the user's setting is also enabled you can do that by signing in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center > Users then click Active users.

  3. In the list of users, click the user and on the page and under More Settings, click Edit Skype for Business properties .

  4. In the Skype for Business admin center, click External Communications and then on Options page, click External Skype for Business users.

  5. Click Save.

Note: You may have to wait for up to 24 hours before any changes take effect.

To let users contact Skype for Business users in another organizations using the classic admin center

Let all of your users to contact Skype for Business users in another organization
  1. Sign in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center > Settings.

  3. Under External Sharing > Skype for Business and it opens the Skype for Business page.

  4. On Skype for Business page, click Let people in your organization use Skype for Business to contact people in other organizations.

  5. After you enable it, you need to chose whether you want to allow all domains, then block some from communicating with your organization or allow only specific domains to communicate with your organization.

    Note: Although it depends on your organization, it's recommended that you use the Only for allowed domains setting and add the partner organization's domain to the list.

    • If you want to allow some domains, but block others, click Except for blocked domains and enter the name of names of the domains that you don't want your organization to communicate with.

    • If you only want to allow specific domains, click Only for allowed domains then add the name of the organization's domain that you want to communicate with.

    Note: When you enter domains, you will need to separate each domain you enter with a comma.

  6. Click Save.

Let a user contact Skype for Business users in another organization
  1. After you enable it for your organization above, you should verify that the user's setting is also enabled you can do that by signing in to Office 365 with your work or school account.

  2. Go to the Office 365 admin center > Admin and then click Skype for Business.

  3. In the Skype for Business admin center > Users, click the user then click Edit.

  4. Click External communications and then on user's Options page, click External Skype for Business users.

  5. Click Save.

Note: You may have to wait for up to 24 hours before any changes take effect.

Want to learn more about this?

  • The organization you’re communicating with must also allow communication with your domain. If the other organization has Lync or Skype for Business Server on premises, refer them to the TechNet article Configuring Federation Support for a Lync Online Customer.

  • When you’re communicating with someone in another Office 365 domain, you can only use Skype for Business features (for example, video conversations or desktop sharing) that are turned on in both organizations.

  • If the setting is changed from “Only for allowed domain” to “Except for blocked domain”, the domains that are listed won’t be kept.

  • If a Skype for Business user in your organization is put on an In-place or Litigation Hold, any IM conversations between that user and other Skype for Business or Skype user will be saved in Recoverable Items in their mailbox. These conversations won’t be saved to the Conversations History folder in their mailbox.

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