Administrator's Manual 17. Configuring SIP Settings
Version 2.2.8 105 400HD Series IP Phones
Parameter Description
[voip/signalling/sip/redundant_proxy/
dual_reg/t1]
Only relevant if dual registration / redundancy server is
configured. Allows quicker retransmission of SIP
messages than the Web interface parameter
'Transmission Timer T1' and overrides it if configured.
Default: 20 milliseconds. Range: 20-200.
Retransmission Timer T2
[voip/signalling/sip/sip_t2]
The maximum interval (in msec) between
retransmissions of SIP messages (according to RFC
3261).
The valid range is 4000 to 60000.
The default value is 4000.
Note: The time interval between subsequent
retransmissions of the same SIP message starts with
SipT1Rtx and is multiplied by two until SipT2Rtx.
Retransmission Timer T4
[voip/signalling/sip/sip_t4]
The SIP T4 retransmission timer according to RFC
3261.
The valid range is 5000 to 60000.
The default value is 5000.
INVITE Timer
[voip/signalling/sip/sip_invite_timer]
The SIP INVITE timer according to RFC 3261.
The valid range is 0 to 65535. The default value is
32000.
Session-Expires
[voip/signalling/sip/session_timer]
The time (in seconds) at which an element considers the
call timed out if no successful INVITE transaction occurs
beforehand. This value is inserted into every INVITE in
the Session-Expires header unless it is configured to 0.
If the timer option tag is not part of the supported list, the
sessionExpires value is ignored.
The valid range is 0 to 65535. The default value is 1800.
Min-SE
[voip/signalling/sip/min_session_interval]
The minimum value for the session interval that the
application is willing to accept.
The valid range is 0 to 65535. The default value is 90.
[voip/signalling/sip/unregister_on_vo
ip_reload]
If the VoIP application needs to be reloaded, the
application by default sends a SIP Registration message
with Expires:0, which means unregister.
By setting this parameter to 1, the application will not
send the unregistration message when its reloaded.
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