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It is currently in the penalty box and there is another transport left to try. It before UDP and TCP targets are released from the penalty box. Now, let’s assume endpoint “B” comes back to life and the Mediatrix unit tries again to contact This fails as well and the TCP target is also placed Then tries to contact endpoint “B” via TCP. After a timeout period, the UDP target is placed in the penalty box and the unit In this case, the Mediatrix unit first tries to contact endpoint There is no DNS SRV entry to specify which transports to use in which order. Tries to reach endpoint “B” for which the destination address does not specify a transport and Let’s say for instance that the Mediatrix unit supports both the UDP and TCP transports. In that case, the highest priority target is used. Unless all the targets are in the penalty box. Which are a combination of address, port, and transport. Note: It is not the destination itself that is placed in the penalty box, but rather targets,

Enabling the Media Security Agreement Parameter.Setting the Session Refresh Information.Overriding the Default Mapping for ISDN Cause to SIP Error Codes.Overriding the Default Mapping for SIP Error Code to ISDN Cause.Relation Between Minimum and Maximum Values.SDP in Session Timer reINVITEs or UPDATEs.Default Conversion of Standard Q.850 ISDN Cause Codes to SIP Error Codes.Default Conversion of Standard SIP Error Codes To ISDN Q.850 Cause Codes.