Firewall ports to open for video conferencing

Problem Description:
Video conferencing traffic is blocked on firewalls preventing two-way audio and video conversations. If the firewall is not H.323 aware, you will likely need to open select ports.
Resolution: For alternate solutions that do not require opening specific firewall ports, see the Emblaze-VCON white paper on this topic.

Most importantly, Emblaze-VCON announced in summer 2003 a family of products under the SecureConnect brand name. The products in the family offer secure firewall traversal and encrypted communications.
The table below describes the typical ports used for H.323 traffic flows.

Common/Required:
PORT TYPE PROTOCOL DESCRIPTION
1719 Static UDP Gatekeeper RAS
1720 Static TCP Q.931 (Call Setup)
1024-65535 Dynamic TCP H.245(Call Parameters)
1024-65535 Dynamic UDP (RTP) Video Data Streams
1024-65535 Dynamic UDP (RTP) Audio Data Streams
1024-65535 Dynamic UDP (RTCP) Control Information
Optional:
PORT TYPE PROTOCOL DESCRIPTION
389 Static TCP ILS Registration (LDAP)
1002 Static TCP Site Server Registration (Windows 2000 Built-in LDAP)
1503 Static TCP T.120 (Data Channel)
1718 Static UDP Gatekeeper Discovery (requires multicast address 224.0.1.41)
22136 Static TCP Emblaze-VCON MXM — Remote Emblaze-VCON Endpoint Admin
26505 Static TCP Emblaze-VCON MXM — Remote Console Login
Related Notes or Documents:

Traversing Firewalls and Proxies with Video over IP (H.323): Issues and Solutions
Adobe PDF Document — 92K
File Date: Nov 13, 2003

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