Setting Up Cisco Unified IP Phones using SIP
How to Configure the SIP Registrar
108
Cisco Unified SCCP and SIP SRST System Administrator Guide
OL-13143-04
What to Do Next
For incoming SIP Register messages to be successfully accepted, users must also set up a voice register
pool. See the
“Configuring Backup Registrar Service to SIP Phones” section on page 108
.
Configuring Backup Registrar Service to SIP Phones
Backup registrar service to SIP IP phones can be provided by configuring a voice register pool on SIP
gateways. The voice register pool configuration provides registration permission control and can also be
used to configure some dial-peer attributes that are applied to the dynamically created VoIP dial peers
when SIP phone registrations match the pool. The following call types are supported:
•
SIP IP phone to or from:
–
Local PSTN
–
Local analog FXS phones
–
Local SIP IP phone
The commands in the configuration below provide registration permission control and set up a basic
voice register pool. The pool gives users control over which registrations are accepted by a Cisco Unified
SIP SRST device and which can be rejected. Registrations that match this pool create VoIP SIP dial peers
with the dial-peer attributes set to these configurations. Although only the
id
command is mandatory,
this configuration example shows basic functionality.
For command-level information, see the appropriate command page in
Cisco Unified SRST and Cisco
Unified SIP SRST Command Reference (All Versions).
Step 6
registrar server
[
expires
[
max
sec
] [
min
sec
]]
Example:
Router(conf-serv-sip)# registrar server expires
max 600 min 60
Enables SIP registrar functionality. The keywords and
arguments are defined as follows:
•
expires
: (Optional) Sets the active time for an incoming
registration.
•
max
sec
: (Optional) Maximum expiration time for a
registration, in seconds. The range is from 600 to
86400. The default is 3600.
Note
Ensure that the registration expiration timeout is set
to a value smaller than the TCP connection aging
timeout to avoid disconnection from the TCP.
•
min
sec
: (Optional) Minimum expiration time for a
registration, in seconds. The range is from 60 to 3600.
The default is 60.
Step 7
end
Example:
Router(conf-serv-sip)# end
Returns to privileged EXEC mode.
Command or Action
Purpose
