100 Reliable Retransmission Configuration; Sip Session Timer - Yealink SIP-T2 Series Administrator's Manual

Administrator's Guide for SIP-T2 Series/T4 Series/T5 Series/CP920 IP Phones
CSeq: 2 INVITE
Contact: <sip:1025@10.3.6.197:5060>
Authorization: Digest username="1025", realm="pbx.test.com", nonce="BroadWorksXi5stub71Ts2nb05BW", uri-
i="sip:1024@pbx.test.com:5060", response="f7e9d35c55af45b3f89beae95e913171", algorithm=MD5, cnon-
ce="0a4f113b", qop=auth, nc=00000001
Content-Type: application/sdp
Allow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH, UPDATE,
MESSAGE
Max-Forwards: 70
User-Agent: Yealink SIP-T46G 28.82.0.20
Supported: 100rel
Allow-Events: talk,hold,conference,refer,check-sync
Content-Length: 302
Topic

100 Reliable Retransmission Configuration

100 Reliable Retransmission Configuration
The following table lists the parameter you can use to configure the 100 reliable retransmission.
Parameter account.X.100rel_enable
Description It enables or disables the 100 reliable retransmission feature.
0-Disabled
Permitted
Values
1-Enabled
Default 0
Web UI Account->Advanced->Retransmission
[1]
X is the account ID. For T54S/T48S/T48G/T46S/T46G/T29G, X=1-16; for T52S/T42G/T42S, X=1-12;for T41P/T41S/T27G,
X=1-6;for T40P/T40G/T23P/T23G, X=1-3; for T21(P) E2, X=1-2; for T19(P) E2/CP920, X=1.

SIP Session Timer

SIP session timers T1, T2 and T4 are SIP transaction layer timers defined in
figurable on IP phones.
Timer T1
Timer T1 is an estimate of the Round Trip Time (RTT) of transactions between a SIP client and SIP server.
Timer T2
Timer T2 represents the maximum retransmitting time of any SIP request message. The re-transmitting and doubling of
T1 will continue until the retransmitting time reaches the T2 value.
Example:
474
[1]
<MAC>.cfg
RFC 3261. These session timers are con-