SIP-H680 Series IP Phone User Manual
SIP session timer T1: Timer T1 is an estimate of the round trip time (RTT) of the transaction between the
SIP client and the SIP server.
SIP session timer T2: Indicates the maximum retransmission time of any SIP request message. The
retransmission multiplication of T1 will continue until the retransmission time reaches the value of T2.
For example: the user registers a SIP account and sets the values of timer T1 and timer T2 respectively
(timer T1:0.5, timer T2:4). The SIP registration request message will be retransmitted between the phone
and the SIP server. The retransmission multiplication of timer T1(0.5) will continue until the retransmission
time reaches timer T2(4). The total registration request retry time will be less than 64 times of T1 (64 * 0.5 =
32). The retransmission interval is: 0.5s, 1s, 2s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s, 4s,
4s.
SIP session timer T4: Indicates the time for the network to clear messages between the SIP client and
server.
6.5.2 Local SIP port and TLS SIP port
If NAT is not enabled, the port number is displayed in the header of Via and Contact in the SIP message. If
NAT is enabled, the phone will use the NAT port and address in the header fields of via and contact, but will
still use the configured source port.
- Configure local SIP port and TLS SIP port via web page
1. Login Web interface.
2.
Click Settings(E)->
The SIP configuration (*).