Table of Contents
Advertisement
No response after a CALL PROC message
After receiving a CALL PROC message from the terminating user, if timer
T310 expires before any call progress indication is received from the
terminating user, the DMS-250 switch releases the call and provides
call-not-accepted treatment. Call progress indication is in the form of one of
the following messages: ALERT, CALL PROC, CONN, or REL. The call
control in this event is shown in Figure 5-26.
Figure 5-26
PRI-to-PRI call setup, no response after CALL PROC message
Originating
user
Start T303.
Stop T303.
Start T310.
T303 expires.
Originator is rerouted.
Protocol violations
If a protocol violation is detected during the termination of a call over a PRI
interface, the originator responds to the network with a REL message
indicating the reason for the protocol violation. Possible protocol violation
cause values include the following:
information element does not exist
protocol error unspecified
message type is nonexistent
invalid information element contents
mandatory information element is missing
message is not compatible with state
If the DMS-250 switch receives a REL or DISC message with any of these
cause values, it reselects or route advances.
Digital Switching Systems DMS-250 ISDN Reference Manual MWC14 (CSP14)
Network
SETUP
CALL PROC
Call control procedures 5-43
Terminating
user
SETUP
CALL PROC
REL
Advertisement
Table of Contents
