Configuring Regional Parameters and Supplementary Services
Control Timer Values (sec)
Cisco Small Business SPA300 Series, SPA500 Series, and WIP310 IP Phone Administration Guide 180
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• Segment 2: On=0.2s, Off=0.2s
• Segment 3: On=0.2s, Off=0.2s
• Segment 4: On=1.0s, Off=4.0s
• Total Ring Length=60s
Control Timer Values (sec) 
The following table describes all control timer parameters. Each value is displayed 
in seconds.
Field Description
Reorder Delay Delay after far end hangs up before reorder (busy) tone is played. 
0 = plays immediately, inf = never plays. Range: 0–255 seconds. 
Set to 255 to return the phone immediately to on-hook status and 
to not play the tone.
Defaults to 5.
Call Back Expires  Expiration time in seconds of a call back activation. Range: 0–
65535 seconds.
Defaults to 1800.
Call Back Retry 
Intvl
Call back retry interval in seconds. Range: 0–255 seconds.
Defaults to 30.
Call Back Delay  Delay after receiving the first SIP 18x response before declaring 
the remote end is ringing. If a busy response is received during 
this time, the Cisco IP phone still considers the call as failed and 
keeps on retrying.
Defaults to 0.5.