Cisco Expressway - Office 365 Skype for Business Federation Configuration
Tuesday, January 24, 2017
Expressway Configuration
At a high level, the following standard Expressway configuration is required. For more detailed steps refer to the Expressway configuration guides
- Traversal zone between the Expressway-C and the Expressway-E
- Search rule on the Expressway-E directing the inbound calls to the target domain to the Expressway-C via the Traversal zone
- Neighbour zone on the Expressway-C to the CMS Call Bridge
- Search rule on the Expressway-C directing the inbound calls to the target domain to the CMS Neighbour zone for Microsoft SIP calls (Microsoft Variants)
- External SRV record for Federation noted in the table below
External DNS record:
| Type | Example | Port | Target |
|---|---|---|---|
| SRV | _sipfederationtls._tcp.domain.com | 5061 | expressway-e.domain.com |
Office 365 - Skype for Business Configuration
From the Office 365 Admin Center, the Federation settings can be changed in two locations.
Steps for location one
- Click Settings > Services & add-ins from the left navigation
- On the Services & add-ins screen, click Skype for Business
- The default permits Federation with all domains
- Alternatively, selectively allow Federation by selecting All domains are blocked except and adding the desired domain/s into the list
Steps for location two
- Admin centers > Skype for Business from the left navigation
- Click on the Organization object from the left navigation
- Click on the external communication top navigation
- By default, it is set to On except for blocked domains, essentially open Federation
- Similar to above, this could be changed to On only for allowed domains
