R2511-HP MSR Router Series Voice Configuration Guide(V5)
201
Ste
p
Command
Remarks
4. Enable the real-time
switching function in
the SIP server group.
hot-swap enable Disabled by default.
NOTE:
The real-time switching time is determined by the voip timer voip-to-pots command. For more information
about the voip timer voip-to-pots command, see
Voice Command Reference
.
Configuring the keepalive and redundancy functions
Use the keepalive function to detect whether the SIP servers in a SIP server group are reachable. The SIP
trunk device selects the current server according to the detect results and the redundancy mode. If the
keepalive function is disabled, the current server is always the one with the highest priority in the SIP
server group.
A SIP server group might operate in one of the following keepalive modes:
• OPTIONS mode—The SIP trunk device periodically sends OPTIONS messages to detect the servers.
If the SIP trunk device receives response message 408 or 5XX (excluding 502, 504, 505, and 513)
from a SIP server after sending an OPTIONS message, it considers the SIP server unreachable.
• REGISTER mode—The REGISTER message can be used to detect the SIP servers. If the SIP trunk
device receives response message 408 or 5XX (excluding 502, 504, 505, and 513) from a SIP
server after sending a REGISTER message, it considers the SIP server unreachable.
The redundancy mode of a SIP server group is configured in SIP client view. A SIP server group operates
in one of the following redundancy modes:
• Parking mode—The SIP trunk device sends the OPTIONS or REGISTER message to the current server.
When the current server is not available, the SIP trunk device selects the member server with the
second highest priority in the SIP server group as the current server even if the original current server
recovers. Before the parking mode is applied, use the keepalive command to set OPTIONS or
REGISTER as the keep-alive mode.
• Homing mode—The SIP trunk device sends the OPTIONS messages to both the current server and
the member server with the second highest priority in the SIP server group. When the current server
is not available, the SIP trunk device selects the member server with the second highest priority as
the current server. Once the original current server recovers, or a server with a higher priority than
the current server is available in the SIP server group, the SIP trunk device selects the original current
server or the server with the highest priority as the current server. Before the homing mode is applied,
use the keepalive command to set OPTIONS as the keepalive mode.
To configure the keepalive and redundancy functions for the SIP server group:
Ste
p
Command
Remarks
1. Enter system view.
system-view N/A
2. Enter voice view.
voice-setup N/A
3. Create a SIP server
group and enter SIP
server group view.
server-group group-number N/A