Table of Contents
Advertisement
5-28 Call control procedures
The originating and terminating PRI interfaces are deallocated and idled as
shown in Figure 5-18.
Figure 5-18
DISC with cause (three-message sequence)
(PRI)
Originating
user
The DMS-250 switch supports a two-message release sequence when
handling abnormal error conditions. This sequence involves a REL–REL
COM sequence of messages. The net results are identical to the
three-message release sequence (the release sequence begins with a DISC
message).
In Figure 5-19, the network receives a REL message from the terminator
indicating an abnormal call clearing. This REL with cause is relayed to the
originating PRI as a DISC message and a REL COM message is sent to the
terminator. The sequence of DISC, REL, REL COM for the originator is as
in normal call clearing.
297-2521-106 Standard 23.01 March 2001
Network
DISC (cause)
REL
REL COM
(PRI)
Terminating
user
DISC (cause)
REL
REL COM
Advertisement
Table of Contents
