Lncoming Calls (Gsils Trunks); Dialing A Co Trunk - Mitel SX-5 Manual

SECTION MITL9103-098-180-NA
SPEECH P A W S
EXTENSION I
EXTENSIOM 2
EXTENSION 3
EXTEMSION
4
EXTENSlOll 5
EXTENSION 6
INCOWING TRUNl
NOT USED
Toucn
mm
RECEIVER
mucn
TONE RECEIVER
OIAL T O M OrnCrOR
DIAL T O M OET€CMR
PIEING
W S l C
0IIIM)lM
TRUNK
I
o m l m
TRUNII 2
m
USED
NOT USED
m a c
T O M GENERATOR
DIAL TONE GENERATOR
RINSBACX GENERATOR
REORDER GENERATOR
VOICE SYNTHESIZER
NOT
usm
1 1 1 1 1 1
NOTES: ind~cstas c l o d c o l n c n w U c l c o m ~ l n e
a
c o m c l ~ o a b w . . c l E n
2 and tlw Dial T o n G n n ~ w .
X5548
L
"grounds" the output of any extension or trunk
connected to
it,
thus preventing parties on the
HOLD junctor from hearing each other. Alter-
natively, music may be connected to the
HOLD
junctor which will then be heard by calls on hold
Incoming Calls (GSILS Trunks)
9.24
A trunk circuit has various methods o f re-
cognizing an incomtng call. When the trunk
is ground start, 6 seconds of ground on the TIP
lead or 240 ms of ringing after TIP ground sig-
nals that an incoming call is present When the
trunk is loop start, either battery reversal or 240
ms o f ringing voltage signals that an incoming
call
is present The change in Tip/Ring
status
is re-
flected on the data bus leads from the trunk
circuit to inform the .CPU that an incoming call is
present
9.25
The CPU finds and tests a free speech
path, and connects ringing to the ap-
propriate extension (defined by programming).
When the ringing extension answers, the CPU
connects
it
and the trunk to the speech path.
Dialing a CO Trunk
Page
1 6
Fig. 9-8 Speech Path Accessing
9.26 When an extension has gone off-hook and
is connected to a dial tone generator and
receiver (see 9.15, Dial Tone and 9.17, Dialing
Internally), the trunk access code is dialed Upon
determining the validity of this code, the CPU
interrogates its memories to find a free trunk
circuit Under the control of the CPU the trunk
circuit is connected to the extension's speech
path (see 9.14, Speech Path Accessing). If the
trunk is a "ground start", the ring lead is grounded
and the CPU waits for CO acknowledgement
When acknowledgement is received, the CPU
connects the trunk's audio circuitry to the speech
pa*
9.27 The receiver is disconnected when the
trunk access code is detected if: (a) both
the extension and trunk are DTMF; or (b) if Toll
Denial is not checked If the extension requires
DTMF-to-DP
conversion,
the receiver connec-
tion is maintained until dialing is completed Toll-
Denial requires that the recelver connection be
maintained on the speech path until the required
number of digits has been dialed