Specifications

310HD, 320HD and 420HD IP Phones
 Using the Configuration file:
Table 17-4: SIP Timers Parameters
Parameter Description
Retransmission Timer T1
[voip/signalling/sip/sip_t1]
The time interval (in msec) between the first
transmission of a SIP message and the first
retransmission of the same message (according to
RFC 3261).
The valid range is 100 to 60000. The default value is
500.
Note: The time interval between subsequent
retransmissions of the same SIP message starts with
SipT1Rtx and is multiplied by two until SipT2Rtx. For
example (assuming that SipT1Rtx = 500 and SipT2Rtx
= 4000):
 The first retransmission is sent after 500 msec.
 The second retransmission is sent after 1000
(2*500) msec.
 The third retransmission is sent after 2000 (2*1000)
msec.
 The fourth retransmission and subsequent
retransmissions until SIPMaxRtx are sent after 4000
(2*2000) msec..
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.
Administrator's Manual 100 Document #: LTRT-09910