Filter
Top Products
Chapter 8. SIP Services
SIP (Session Initiation Protocol) is a protocol for creating and terminating various media stream sessions over an IP
network. It is for example used for Internet telephone calls and distribution of video streams.
SIP takes care of the initiation, modification and termination of a session with one or more participants. The
protocol makes it possible for the participants to agree on what media types they should share. You can find more
information about SIP in appendix A, More About SIP, and in RFC 3261.
You find examples on how to configure your 3Com VCX IP Telecommuting Module for SIP in chapter 4, How To
Configure SIP.
The SIP module in 3Com VCX IP Telecommuting Module handles SIP requests for users who have registered on a
machine connected to the Telecommuting Module. The module forwards the request through the Telecommuting
Module, which enables users behind different network interfaces to make contact. The SIP module controls the
security rules to temporarily let through the media streams that the users agree on, on their assigned ports.
You must enter a DNS server and a Default gateway on the Basic Configuration page to make the SIP module
work satisfactorily.
Administration of SIP
To enable the SIP function of the Telecommuting Module, you must at least configure on the Basic page.
These SIP functions are configured in the SIP Services section:
• SIP module on/off.
• SIP logging.
• Port range for SIP media.
• Interoperability settings.
• SIP timeouts.
• Remote SIP Connectivity (requires a Remote SIP Connectivity Module).
Basic
Here, you make basic settings for the Telecommuting Module SIP management.
General
Here, select whether the SIP module should be activated or not. If you select to turn the SIP module Off, no other
SIP settings will have any effect.
SIP media port range
State a port interval which the Telecommuting Module should use for SIP media streams. You can use any high
ports except 4500 (reserved for NAT-T) and 65097-65200 (reserved for RADIUS).
Enter the lower and upper limit of the port range that the Telecommuting Module should use for media streams. The
upper limit must be at least as high as the lower limit.
69