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Configuring Basic Features571100 Reliable RetransmissionAs described in RFC 3262, 100rel tag is for reliability of provisional responses. When present ina Supported header, it indicates that the IP phone can send or receive reliable provisionalresponses. When present in a Require header in a reliable provisional response, it indicates thatthe response is to be sent reliably.Example of a SIP INVITE message:INVITE sip:1024@pbx.test.com:5060 SIP/2.0Via: SIP/2.0/UDP 10.3.6.197:5060;branch=z9hG4bK1708689023From: "1025" test.com:5060>;tag=1622206783To: test.com:5060>Call-ID: 0_537569052@10.3.6.197CSeq: 2 INVITEContact: Authorization: Digest username="1025", realm="pbx.test.com", nonce="BroadWorksXi5stub71Ts2nb05BW",uri="sip:1024@pbx.test.com:5060", response="f7e9d35c55af45b3f89beae95e913171", algorithm=MD5,cnonce="0a4f113b", qop=auth, nc=00000001Content-Type: application/sdpAllow: INVITE, INFO, PRACK, ACK, BYE, CANCEL, OPTIONS, NOTIFY, REGISTER, SUBSCRIBE, REFER, PUBLISH,UPDATE, MESSAGEMax-Forwards: 70User-Agent: Yealink SIP-T46G 28.81.0.25Supported: 100relAllow-Events: talk,hold,conference,refer,check-syncContent-Length: 302Procedure100 Reliable Retransmission can be configured using the following methods.Central Provisioning(Configuration File)<MAC>.cfgConfigure the 100 reliableretransmission feature.Parameter:account.X.100rel_enableWeb User InterfaceConfigure the 100 reliableretransmission feature.Navigate to:http:///servlet?p=account-adv&q=load&acc=0
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