GW various Sound Instructions

1.dt:dial Tone (not related to GW) dial tone
Public network GW SIP
<--------DT (lifting machine)


DT-----> (Lifting machine)

2.rbt:ringer busy tone back ring tone

Public network GW SIP
->invite
<-180
&LT;-RBT-----------
&LT;-RBT----------------------------


<-setup
->alert
-RBT---------------------------->

3. Sdt:second dial Tone (second dial tone, GW self-generated) first dial the host number, then the extension number
Public network GW SIP
<--------DT (lifting machine)
->setup
&LT;-C.P.
<-con
->conn ACK

&LT;--SDT----
->invite

4. HST: (Reserved tone)
Public network GW SIP
Press the Hold
<-----HST--------(hold,hold2, inner)


Press the Hold
-------------HST------------------> (fmisck Miscellaneous Board, retaining sound production board)

5. bt:busy Tone Busy tone
Public network GW SIP
Hanging Machine <-----BT------

Hanging machine
-------------------------BT------->


Reguser is the GW user number that tells the CM server.

GW various Sound Instructions