TANDBERG MOVI 4.0 - Administrator's Manual - How Movi Communicates
How Movi communicates
TANDBERG Movi Administrator guide
Page 14 of 22
How Movi communicates
Communication in Movi can be divided into two main categories: SIP and media. This section includes
general information on these types of communication and is essential for understanding the next section.
SIP communication
Movi communicates with the VCS using the Session Initiation Protocol (SIP). Subscribing, registering,
presence querying, call invites - all is done in SIP. SIP messages are sent using TCP, with or without TLS
encryption depending on the encryption policy.
The default SIP listening ports used on the VCS are 5060 (unencrypted) and 5061 (encrypted). These are
both configurable. Go to VCS Configurations > Protocols > SIP > Configuration to change the listening
ports.
Note: If you change the SIP listening port number on the VCS, you must also configure the Movi clients to
contact the VCS on this port. See the
Advanced settings
section for more information.
Movi itself will use ephemeral TCP ports for this communication. These ports are handed over to the Movi
client by the TCP stack and are not configurable.
To enable communication with endpoints and other devices that rely on H.323 and do not support SIP,
interworking on the VCS can be used.
Media communication
Media data is transferred through up to nine UDP links (ports). There are at most five media streams:
Audio
Primary video
Secondary video (presentation sharing)
Far end camera control (FECC) – can be disabled through Provisioning
BFCP (Management of Duo video)
Each of these streams (except BFCP) requires two links: one link for RTP packets and one link for RTCP
packets. The SRTP protocol is used if encryption is enabled.
The default port range for Movi to receive media is 21,000-21,900. This range is configurable in TMS:
1.
Go to Systems > Provisioning > Directory.
2.
Add (or select) the configuration’s Media Port Range Start and Media Port Range End.
The default port range used on the VCS is 50,000-52,399. To configure:
1. Go to VCS Configuration > Local zone > Traversal subzone.
2. Set the Traversal media port start and Traversal media port end.
Note that in both cases, the port numbers used will be consecutive, but chosen randomly within the specified
range.
Media routing
Movi 4.0 supports Interactive Connectivity Establishment (ICE) for better media routing. ICE is used if
enabled both in Movi and the far end.