Cisco Cisco TelePresence Management Suite (TMS) Version 15
Component Communication
Port and Protocol Used
Cisco VCS Expressway to WebEx cloud
Set in accordance with the traversal subzone media port range
configured on the Expressway. For more information, refer to
the Inbound (Internet > DMZ) requirements in
Appendix 3:
Firewall and NAT Settings
if using Expressway 8.5.
If using an earlier supported Expressway version, refer to the
same section in the appropriate version of the guide on
Note: For outbound, all ports >1024 need to be opened.
WebEx client to WebEx Cloud
UDP ports 9000-9001*
Note: On WebEx clients using UDP vs TCP, and customers should check their firewall setting to prevent
UDP from being blocked.
IMPORTANT: Firewalls, ports and protocols that do deep packet inspection should not be used.
Specifically, the stateful packet inspection used in Check Point Software Technologies, Inc. firewalls is
incompatible with Cisco VCS Expressway and Expressway-E.
Network and Client Restrictions that Affect Video in the
WebEx Client
WebEx Client
n
WebEx on PC or Mac will not be able to receive video if PC has a bit rate below 500Kbps, or too many
applications open not leaving enough PC CPU or memory for receiving or sending video packets.
n
WebEx clients on PC or Mac connect to WebEx datacenter using UDP if available or TCP if UDP is
blocked. Optimal Video performance requires UDP. Customers should check with their security team to
allow UDP ports for video where possible. Using TCP will prevent video in most cases, especially if using
wifi network that is not optimized.
n
Customers using Internet proxy in most cases will not be able to use UDP, which will cause video
capacity limitations.
Cisco Collaboration Meeting Rooms (CMR) Hybrid Configuration Guide (TMS 14.6 - WebEx WBS29.11)
Page 38 of 254
Information About the CMR Hybrid Solution
Deployment Scenarios