Administrator's Guide

Chapter 10. SIP Services
Save
Saves the Basic Settings configuration to the preliminary configuration.
Cancel
Clears and resets all fields in new rows and resets changes in old rows.
Interoperability
The SIP standard is still young and under considerable development. As an effect, several
implementations of the standard omits parts of it, or makes guesses as to what will be ac-
cepted.
3Com VCX IP Telecommuting Module adheres rather well to the standard (RFC 3261) per
default, but you can also adjust the configuration to make more allowing for known issues
in various SIP implementations.
Loose Routing
The Telecommuting Module uses the parameter "lr" in its SIP signaling to announce to other
SIP devices that it uses loose routing. Some other SIP implementations incorrectly expect
the lr parameter to be followed by a value, i.e. "lr=true". If you select that the Telecommuting
Module should add this value to its SIP signaling, it will work with these implementations,
too. This could affect its interaction with other SIP devices that conform to the SIP standard
very strictly.
Select to use lr or lr=true.
Relaxed Refer-To
The SIP standard requires that a Refer-To header with a question mark in it must be contained
within angle brackets. Some clients do not honor this.
Select whether the Telecommuting Module should accept Refer-To headers without angle
brackets, but containing question marks. The recommended setting is Only allow Refer-To
"?" with angle brackets.
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