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MultiVOIP User Guide Technical Configuration
93
T1 Parameter Definitions (cont’d)
Field Name Values Description
CAS Protocol E&M Immed Strt
E&M Wink Start
E&M Wink with
dial tone
FXO Ground Strt
FXO Loop Start
FXS Ground Strt
FXS Loop Start
Channel Associated Signaling
(CAS) is a method of
incorporating telephony
signaling info into a T1
voice/data stream. In CAS, the
signaling bits (the A, B, C, and
D bits) are multiplexed into the
signal stream of each T1
channel. (By contrast, in
Common Channel Signaling
(CCS), one channel handles
signaling for all other channels.)
Each CAS protocol defines the
states of the signaling bits
during the various stages of a
call (IDLE, SEIZED, ANSWER,
RING-ON, RING-OFF).
The CAS protocol code allows
the VOIP to interact properly
with the PBX or central-office
switch that it serves.
If a user has an old MultiVOIP
unit (with a firmware version
lower than 4.08), and wants to
upgrade to 4.08, the latest CAS
file (4.08) should also be
downloaded into that
MultiVOIP unit. The new CAS
file ensures proper operation
between the MultiVOIP and a
PBX.
Match this parameter to the
setting of PBX or central-office
switch.
FXS Options –
No Response
Timer
1 – 65535
(in seconds)
Length of time before call
connection attempt is
abandoned. Applicable only
when FXS CAS protocol is
selected.