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Question Title Automatic sign-in, domain federation, and other features do not work as expected in Lync Online when you use a custom domain in Office 365

Symptoms

One or more of the following features do not work as expected in Microsoft Lync Online in Microsoft Office 365:
  • Lync Online Autodiscover and automatic sign-in
  • Lync Online federation with external users
  • Public Internet Connectivity (PIC) together with Windows Live, MSN, and Hotmail users
  • Outlook Web Access instant messaging
  • Sign in from Lync Mobile clients by using the Auto-Detect Server option


Cause

This issue occurs if all the following conditions are true:
  • You use a custom or vanity domain in Office 365.
  • Domain Name System (DNS) service (SRV) resource records, alias (CNAME) resource records, or both kinds of records are configured incorrectly for your domain.


Resolution

Make sure that you add the following SRV and CNAME records to your DNS host.

SRV records
Type Service Protocol Port Weight Priority TTL Name Target
SRV _sip _tls 443 1 100 1 hour sipdir.online.lync.com
SRV _sipfederationtls _tcp 5061 1 100 1 hour sipfed.online.lync.com


CNAME records
Type Host name Destination TTL
CNAME sip. sipdir.online.lync.com 1 hour
CNAME lyncdiscover. webdir.online.lync.com 1 hour


Note
The placeholder in this table represents the name of the Session Initiation Protocol (SIP) domain of your organization, such as contoso.com.
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Article Information Additional Information
Article Number: 262
Created: 2013-01-13 12:29 AM
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