Multi-Tech Systems MVP-2410 User Manual

 

 

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.