Media5 Mediatrix 4104, Reference Manual

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Mediatrix 4104 257
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H A P T E R
18
SIP Protocol Features
This chapter defines how to configure the SIP-specific features to properly use the SIP signalling programs
and information defined in Media5’ SIP stack.
User Agents
A user agent is a logical entity that can act as both client and server for the duration of a dialog. Each line (also
known as endpoint) of the Mediatrix 4104 is a user agent.
You can set information for each user agent such as its telephone number and friendly name. This information
is used to dynamically create the
To , From and Contact headers used in the request the user agent sends.
These headers make up the caller ID information that is displayed on telephones/faxes equipped with a proper
LCD display. See
“Caller ID Information” on page 175 for more details.
Most of the variables related to the user agents are located in tables. You can display and define the
information for all lines. You can also use these tables to create/edit five user names and passwords per line.
This means that:

Rows 1-5 of the table are reserved for line 1.

Rows 6-10 of the table are reserved for line 2.

etc.
If you want to enter a user name for the second line, you must do so in the sixth row of the table. If you want
to enter a user name for the third line, you must do so in the eleventh row of the table, and so on.
Before changing a parameter value, build its corresponding table with your MIB browser’s table functionality.
Depending on the MIB browser you are using, the tables may not appear the same way.
You can also set these parameters via the web interface, as described in “SIP User Agent” on page 63 .

To set basic user agent information:
1. In the sipMIB , set the user agent port number in the sipPort variable.
The default value is 0. If sipPort is set to 0, the default SIP port is used.
2. Define whether or not to override the default proxy home domain used by entering a domain in the
sipDomain variable.
This value replaces the home domain proxy host as defined in “Proxy Server” on page 165 . It is
used by the address of record in the To and From headers.
3. In the sipUAIfTable group, set a main user name in the sipUAMainUsername variable.
The main user name uniquely identifies this endpoint in the domain, such as a telephone number.
It is used to create the
Contact and From headers. The From header carries the permanent location
(IP address, home domain) where the endpoint is located. The Contact header carries the current
location (IP address) where the endpoint can be reached. Contact headers are used in two ways:
• First, contacts are registered to the registrar. This enables callers to be redirected to
the endpoint’s current location.
• Second, a contact header is sent along with any request the user agent sends (e.g.,
INVITE), and is used by the target user agent as a return address for later requests to
this endpoint.
In the Unit Manager Network Administration Manual , refer to chapter Signalling Protocols Parameters , section
SIP Configuration Window .