ZyXEL Communications P-27xx Series User Manual page 22

Chapter 3 Phone Use and Configuration
Figure 7 Advanced SIP Settings (part 3)
The following table describes the labels in this screen.
Table 4 SIP Setting
LABEL
Session Timer
Enable
Minimum
Expiration
Time
Maximum
Expiration
Time
Dial Plan
Active
22
DESCRIPTION
Select Enable if you want to define how long the ZyXEL Device waits to
receive a session-alive packet for a voice session from the SIP server.
Enter the minimum time the ZyXEL Device waits for a session-alive
packet (90-65536 seconds).
If a session-alive packet is not received during this time, the voice
session is terminated.
Enter the maximum time the ZyXEL Device waits for a session-alive
packet (90-65536 seconds).
If a session-alive packet is not received during this time, the voice
session is terminated.
Select Active to enable the dial plan feature. A dial plan is used by a
service provider to define the expected rules and digit patterns for the
telephone numbers it uses.
If your dial plan does not match the service provider's, you probably will
not be able to connect to their servers.
P-27XX Series User's Guide