Cisco Cisco IOS Software Release 12.2(15)ZJ

To set the total number of Session Initiation Protocol (SIP) Register messages that the gateway should 
send, use the retry register command in SIP user-agent configuration mode. To reset this number to the 
default, use the no form of this command.

retry register number

no retry register 

10 retries

SIP user-agent configuration

Use the default number of 10 when possible. Lower values such as 1 can lead to an increased chance of 
the message not being received by the other user agent.

The following example specifies that the gateway sends nine Register messages.

sip-ua 

retry invite 9

retry register 9

timers register 150

Number of Register message retries. Range is from 1 to 10. Default is 10.

12.2(15)ZJ

This command was introduced.

Enables SIP gateways to register E.164 numbers on behalf of analog 
telephone voice ports (FXS), IP phone virtual voice ports (EFXS), and SCCP 
phones, with an external SIP proxy or SIP registrar.

Sets how long the SIP UA waits before sending register requests.