To use Cisco WebEx Telepresence, you need to enable TCP port 5061 outbound for Session Initiation Protocol (SIP) communication and TCP port 443 outbound for provisioning and directory services.
For media functionality, WebEx Telepresence devices initiate User Datagram Protocol (UDP) connections by using the following ports:
For both types of devices, the destination port number of the media UDP connections are dynamically assigned, based on SIP Session Description Protocol (SDP) message contents.
To ensure the best user experience, disable the SIP ALG (application-level gateway) functionality in your firewall settings so as not to interfere with the proper operation of WebEx Telepresence.
For more information on disabling the SIP ALG feature, see WebEx Telepresence: Firewall requirements for SIP ALG.