Setting Up Cisco Unified IP Phones using SIP
How to Configure the SIP Registrar
109
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
Prerequisites
•
The SIP registrar must be configured before a voice register pool is set up. See the
“Configuring the
SIP Registrar” section on page 106
for complete instructions.
Restrictions
•
The
id
command identifies the individual SIP IP phone or sets of SIP IP phones that are to be
configured. Thus, the
id
command configured in Step 5 is required and must be configured before
any other voice register pool commands. When the
mac
address
keyword and argument are used,
the IP phone must be in the same subnet as that of the router’s LAN interface, such that the phone’s
MAC address is visible in the router’s Address Resolution Protocol (ARP) cache. Once a MAC
address is configured for a specific voice register pool, remove the existing MAC address before
changing to a new MAC address.
•
Proxy dial peers are autogenerated dial peers that route all calls from the PSTN to
Cisco Unified SIP SRST. When a SIP phone registers to Cisco Unified SIP SRST and the
proxy
command is enabled, two dial peers are automatically created. The first dial peer routes to the proxy,
and the second (or fallback) dial peer routes to the SIP phone. The same functionality can also be
achieved with the appropriate creation of static dial peers (manually creating dial peers that point to
the proxy). Proxy dial peers can be monitored to one proxy IP address, only. That is, only one proxy
from a voice registration pool can be monitored at a time. If more than one proxy address needs to
be monitored, you must manually create and configure additional dial peers.
Note
To monitor SIP proxies, the
call fallback active
command must be configured, as described in Step 3.
SUMMARY STEPS
1.
enable
2.
configure
terminal
3.
call fallback active
4.
voice register pool
tag
5.
id
{
network
address
mask
mask
|
ip
address
mask
mask
|
mac
address
}
6.
preference
preference-order
7.
proxy
ip-address
[
preference
value
] [
monitor probe
{
icmp-ping
|
rtr
} [
alternate-ip-address
]]
8.
voice-class codec
tag
9.
application
application-name
10.
end
