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Use this screen to define retransmission and session keep-alive timer parameters

To View and Edit Timers

On the SBC main screen, go to Configuration > System Provisioning > Category: Trunk Provisioning > Trunk Group > SIP Trunk Group > Signaling > Timers.

 The Timers can be checked for each Address Context, for each Zone, for each SIP Trunk Group created or for all the Address Contexts, Zones and SIP Trunk Groups created. Use the drop-down box to select the desired Address Context, Zone and SIP Trunk Group.

The Edit Timers window is displayed.

Figure : SIP Trunk Group - Signaling - Timers

 

 

The following fields are displayed:

Table : Sip Trunk Group - Signaling - Timers parameters

Parameter

Description

T1

This is the SIP protocol retransmission timer T1 (in milliseconds). T1 is an estimate of the round-trip time (RTT). The value ranges from 1 to 10000 and the default value is 500.

T2

This is the SIP protocol timer T2 (in milliseconds), and represents the maximum retransmit interval for non-INVITE requests and INVITE responses. The value ranges from 1 to 65535 and the default value is 4000.

Tcp Retransmit Timer

The retransmit timer (in seconds) for SIP request over TCP. The value ranges from 0 to 15 and the default value is 6.

Sctp Retransmit Timer

The retransmit timer (in seconds) for SIP request over SCTP. The value ranges from 0 to 15 and the default value is 6.

Session Keepalive

The SIP protocol session keep-alive timer (in seconds). The value ranges from 0 to 65535 and the default value is 1800.

Non Nat Keep Alive Timer

Use this parameter to specify the keep-alive interval (in seconds) for a non-Nat'd device. The value ranges from 0 to 65535 and the default value is 60.

Session Min SE

Minimum expiration value (in seconds) accepted from a Session-Expires header. The value ranges from 0 to 65535 and the default value is 90.

NOTE: When Session Min SE value is less than 90 seconds or when it equals 65535, the SBC does not send an INVITE upon receiving "422 Session Interval Too Small" error message.

Session Termination Delta Time

The time (in seconds) before session expiration at which the SBC sends a BYE if no session refresh request is received. This only applies when acting as the session keep-alive responder (i.e. not refresher) for a call. The value ranges from 0 to 65535 and the default value is 0.
Ocs Dialog Timer This relay control block timer is restarted for each relay request received. If no request is received for the configured period, the dialog is deleted. When the timer is set to “0”, sessionKeepalive flag is disabled. The value ranges from 0 to 10080 and the default value is 1440.

 

Make the required changes and click Save at the right hand bottom of the panel to save the changes made.

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