Cisco CUCM MTP's and OCS/Lync
http://voipnorm.blogspot.com/2009/10/using-mtps-for-interop-for-cucm-to-ocs.html
http://voipnorm.blogspot.com/2010/05/using-remote-mtp-resources-for-ocs.html
Cisco CUCM and Exchange
http://voipnorm.blogspot.com/2009/11/exchange-2010-um-mwi-enablement-for.html
Cisco IP-IP GW (CUBE) and OCS/Lync
http://voipnorm.blogspot.com/2008/12/ip-ip-gw-configuration-notes-for-ocs-to.html
http://voipnorm.blogspot.com/2010/04/new-ocs-2007-r2-cisco-ube-interop.html
Ringback
http://voipnorm.blogspot.com/2010/05/ringback-ringback-ringback-where-are.html
http://blogs.technet.com/b/dougl/archive/2009/07/30/ring-back-workaround-for-ocs.aspx
RTCP timer issue
http://voipnorm.blogspot.com/2010/07/kb-article-981218-rtcp-timer-confusion.html
Cisco interop portal
http://www.cisco.com/en/US/netsol/ns728/networking_solutions_program_category_home.html
OCS/Lync to CUCM using direct SIP
OCS R2 to CUCM 6.1
http://blogs.technet.com/b/drrez/archive/2010/06/11/direct-sip-cisco-unified-communications-manager-6-1.aspx
OCS R2 to 8.0
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns784/893165.pdf
OCS R2 with 7.1
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns784/861590.pdf
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns784/873601.pdf
OCS R2 to CUBE to CUCM 7.1
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns784/873601.pdf
OCS R2 to Cisco ISR
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns784/873601.pdf
http://www.cisco.com/en/US/solutions/collateral/ns340/ns414/ns728/ns835/845178.pdf
Polycom Interop Configuration Documentation
http://support.polycom.com/global/documents/support/setup_maintenance/products/video/Deploying_Visual_Comm_Admin_Guide_WV4.pdf