The response message "lxx" indicates . ( )
Indicates that the request message contains a syntax error or that the SIP server cannot complete processing of the request message
Further action is required to complete the request
Indicates that the request cannot be implemented on any SIP server
Indicates that the request message has been received and is being processed
H.460 Signaling interoperability scheme ( ).
The public network terminal adopts the H.460 protocol for communication
The private network terminal uses the H.460 protocol to communicate
Both public and private network terminals use the standard H.323 protocol to communicate
None of the above statements are true
Under the H. 323 protocol, the signaling required to complete the master-slave decision process is. ( )
TCSR , TCSA
MSDR , MSDA
GRQ , GCF
DRQ , DCF
