Skype for Business Online for Office 365 Firewall Requirements

The following are the requirements of Skype for Business Online for Office 365, note this information can change as the service evolves. This is from the clients machine to Office 365

Firewall Ports

Port Destination Protocol Client Usage Direction

443

TCP

SIP Signalling

Outbound

443

TCP

Audio, Video, Application sharing sessions and Web Conferencing

Outbound

3478

UDP

Audio and Video Sessions

Outbound

5223

TCP

SfB Mobile push notifications –  iOS Only

Outbound

50000 TO 59999 INCLUSIVE

RTC/UDP/TCP

Audio and Video Sessions

Outbound

50000 TO 59999 INCLUSIVE

TCP

Application Sharing and File   Transfer

Outbound

The following is the URL’s that SfB Online from the client will use to get to the SfB Online servers so if the traffic is going through internet proxies and you are having issues these URL’s will be helpful:

*.lync.com
crl.microsoft.com
evsecure-ocsp.verisign.com
evsecure-aia.verisign.com
evsecure-crl.verisign.com
sa.symcb.com
sd.symcb.com
*.omniroot.com
*.verisign.com
*.symcb.com
*.symcd.com
*.verisign.net
*.geotrust.com
*.entrust.net
*.public-trust.com

Finally the last point is if your firewall guys want to lock down access to specific IP addresses (although NOT recommended due to the fact these can be changed) Please refer here:

https://support.office.com/en-us/article/Office-365-URLs-and-IP-address-ranges-8548a211-3fe7-47cb-abb1-355ea5aa88a2?ui=en-US&rs=en-US&ad=US#BKMK_LYO

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