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Chapter 27 Global PBX Settings
ISG50 User’s Guide
432
See Section 13.2 on page 285 to set the WAN trunk the ISG50 uses for default traffic.
Figure 278 Configuration > PBX > Global > SIP Server
Each field is described in the following table.
Table 141 Configuration > PBX > Global > SIP Server
LABEL DESCRIPTION
SIP Server Realm
Name
A realm is a set of usernames and passwords used by SIP client devices to authenticate
with a SIP server. The ISG50 supports a single realm. When SIP clients register with the
ISG50, they must provide the name of the realm they belong to as well as the username
and password. Type the realm name which the extensions that register with the ISG50
must provide for authentication.
Port
Enter the ISG50’s listening port number or keep the default value. This is the port number
your SIP clients need to use to register with the ISG50.
You can also enter up to two different alternate ports.
Default SIP Client
Registration
Expiration
The ISG50 is a SIP registrar server. A SIP registrar server maintains a database of SIP
identity-to-IP address (or domain name) mapping. The ISG50 checks your username,
password and realm when you register.
Enter the number of seconds SIP clients are registered with the ISG50 before their
registration record is deleted.
Make sure that the client SIP devices are configured to re-register at an interval smaller
than the time set in this field.
You can enter expiration times for SIP clients that use NAT as well as those that do not.
RTP Port Range
When you make a VoIP call using SIP, the RTP (Real time Transport Protocol) is used to
handle voice data transfer.
Enter the listening port number(s) for RTP traffic or keep the default values. Enter the
port number at the beginning of the range in the first field and enter the port number at
the end of the range in the second field.
Default Ring Time
Specify for how many seconds the ISG50 sends a ringing tone to client devices for
incoming calls.