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When a PRACK Not Matched message is found, how to identify what condition was not matched? Also how to check what provisional matter it wants to check. sajit4134 10-July-2008 06:01:14 AMComments Provisional response acknowledgement (PRACK ) is an IETF SIP extension that enables reliable transmission of provisional responses,Confirms that the client has received a final response to an INVITE. PRACK is similar to ACK, but specific to the reliability of provisional responses. The PRACK message is used in opening one-way media sessions before a call is established and for quality of service (QoS) negotiation before completing an INVITE transaction. Each provisional response contains a sequence number that is stored in the RSeq header field in the provisional response. The RSeq header is used to transmit the provisional responses reliably. The PRACK messages contain an RAck header field, which indicates the sequence number of the provisional response that is being acknowledged. This header field is sent in a PRACK request to support reliable transmission of provisional responses. Posted by sagitraz |
Posted: 10-July-2008 10:13:34 AM By: sagitraz Provisional response acknowledgement (PRACK ) is an IETF SIP extension that enables reliable transmission of provisional responses,Confirms that the client has received a final response to an INVITE. PRACK is similar to ACK, but specific to the reliability of provisional responses. The PRACK message is used in opening one-way media sessions before a call is established and for quality of service (QoS) negotiation before completing an INVITE transaction. Each provisional response contains a sequence number that is stored in the RSeq header field in the provisional response. The RSeq header is used to transmit the provisional responses reliably. The PRACK messages contain an RAck header field, which indicates the sequence number of the provisional response that is being acknowledged. This header field is sent in a PRACK request to support reliable transmission of provisional responses. |