Resolution 1: Individual Client
Click on the Gear in the upper right hand corner > Click on Tools > Options > Personal (on the left) > click Advanced button near the user id > choose Manual Configuration >
Internal Server Name: sipdir.online.lync.com:443
External Server Name: sipdir.online.lync.com:443
Resolution 2: Entire Organization
Go to your DNS server
Create CNAME alias
Alias name: lyncdiscover
FQDN: lyncdiscover.yourdomain.com
FQD for target host: webdir.online.lync.com
Create CNAME alias
Alias name: sip
FQDN: sip.yourdomain.com
FQD for target host: sipdir.online.lync.com
Create Other Record > Service Location (SRV) Resource Record (may already be created)
Domain: yourdomain.com
Service: _sip
Protocal: _tls
Priority: 100
Weight: 1
Port number: 443
Host offering this service: sipdir.online.lync.com
To verify this go to DNS > expand domain > look at the "_tcp" folder and then look for the sipfed.online.lync.com record.
Go to the client machine and run "ipconfig /flushdns" and also verify the DNS server that he is using to authenticate against.
Below
are the DNS records required for Skype for business online
SRV
records
Type
|
Service
|
Protocol
|
Port
|
Weight
|
Priority
|
TTL
|
Name
|
Target
|
SRV
|
_sip
|
_tls
|
443
|
1
|
100
|
1 hour
|
Domain.com
|
sipdir.online.lync.com
|
SRV
|
_sipfederationtls
|
_tcp
|
5061
|
1
|
100
|
1 hour
|
Domain.com
|
sipfed.online.lync.com
|
CNAME
for Lync Desktop client Autodiscover
Type
|
Host
name
|
Destination
|
TTL
|
CNAME
|
sip.yourDomainName.com
|
sipdir.online.lync.com
|
1
hour
|
CNAME
for Lync Mobile client Autodiscover
Type
|
Host
name
|
Destination
|
TTL
|
CNAME
|
lyncdiscover.yourDomainName.com
|
webdir.online.lync.com
|
1
hour
|
Reference
articles.
Setup
Skype for business online.
Skype
for business network requirements.
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