Abstract: building a whitelist / allow list or block some Lync / Skype clients might be a hard work as there exist no complete or up to date list in the internet which list all (or nearly all) possible user-agent strings.
So here is a list, if you wish to keep it growing feel free to leave a comment and I will update the list:
| Client | Example User Agent string | User Agent needed for client version policy |
| Client for Android | RTCC/6.0.0.0 UCWA/6.0.0.0 AndroidLync/6.2.0.3 | AndroidLync |
| Client for Android | RTCC/6.0.0.0 UCWA/6.0.0.0 AndroidLync/6.1.0.1 | AndroidLync |
| Client for Windows Mobile 10 | RTCC/6.0.0.0 UCWA/6.0.0.0 WpLync/6.3.1558.0 | WpLync |
| Client for iPhone | RTCC/6.0.0.0 UCWA/6.0.0.0 iPhoneLync/6.3.0.0000 | iPhoneLync |
| Client for iPhone | RTCC/6.0.0.0 UCWA/6.0.0.0 iPhoneLync/6.2.5.0000 | iPhoneLync |
| Client for iPad | RTCC/6.0.0.0 UCWA/6.0.0.0 iPadLync/6.2.5.0000 | iPadLync |
| Client for Skype for Business on Windows | UCCAPI/15.0.4805.1000 OC/15.0.4805.1000 | OC |
| Client for Skype for Business on Windows | UCCAPI/16.0.4339.1000 OC/16.0.4339.1000 | OC |
| Client for Skype for Business on Windows | UCCAPI/16.0.4300.1000 OC/16.0.4300.1001 | OC |
| Client for Skype for Business on Windows | UCCAPI/15.0.4805.1000 OC/15.0.4805.1000 | OC |
| Microsoft Lync 2010 | UCCAPI/4.0.7577.314 OC/4.0.7577.314 | OC |
| Microsoft Lync client for Mac 2011 | UCCAPI/4.0.*.* MC/14.*.*.* | MC |
For you own reference here is a list of possible older clients:
| Client | Example User Agent string | User Agent needed for client version policy |
| Microsoft Office Communicator 2007 R2 | UCCAPI/3.5.6907.0 OC/3.5.6907.0 | OC |
| Microsoft Office Communicator | UCCP/2.0.6362.0 OC/2.0.6362.0 | OC |
| Lync Mobility for Nokia Symbian OS | Â | Nokialync |
| Microsoft Lync 2010 Phone Edition | CPE/4.0.*.* OCPhone/4.0.*.* | OCPhone |
| Office Communicator Phone 2007 R2 | CPE/3.5.*.* OCPhone/3.5.*.* | OCPhone |
For you own reference here is a list of other possible clients:
| Client | Example User Agent string | User Agent needed for client version policy |
| Microsoft Lync Web App | RTCC/3.0.0.0 CWA/3.0.6362.0 | CWA |
| Microsoft Lync Gateway | RTCC/6.0.0.0 LyncSkypeGateway2/1.0.*.* | LyncSkypeGateway2 |
| Lync Mobility Service (MCX) | RTCC/4.0.0.0 McxService/4.0.0.0 | McxService |
| LyncImm | UCCAPIIMM/15.0.4481.1503 LyncImm/15.0.4481.1503 | LyncImm |
| Polycom RealPresence Trio | Polycom/5.4.4.7609 PolycomRealPresenceTrio-Trio_8800-UA/5.4.4.7609 | PolycomRealPresenceTrio-Trio_8800-UA |
And here is a list of abbreviation used:
| abbreviation | meaning |
| UCCP | Unified Communications Platform |
| OC | Office Communicator Platform |
| CPE | Communicator Phone Edition Platform |
| AOC | Attendee-only client |
| McxService | Mobility service |
| RTC | Real-time Communications Client |
| LWA | Lync Web App |
| LMC | Live Meeting Communicator |
| UCWA | Unified Communications Web API |
| CSA | Conferencing Announcement Service |
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