Specifications

Chapter 7 – Call-Related Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 98
7.9 ATH Disconnect Existing Connection
Description: Disconnect existing call from command line by local TE and terminate call.
Syntax: Exec Command: ATH[<n>]
Response: OK
Parameter:
<n>
0 Disconnect from line and terminate call. This is the default value if the parameter is
omitted (0 will be assumed).
Notes:
• OK is issued after circuit 109 (DCD) is turned off, if it was previously on.
• ATH terminates every circuit switched call (voice or data), even if it is issued via another interface. This behavior
is in accordance with ITU-T V.250; (07/97, “Hook control”: “ATH is terminating any call in progress.”).
• ATH clears any active PDP context or terminates any existing PPP connection, but only if issued on the same
interface where GPRS is used and if there is no pending network request for PDP context activation. It does not
affect PDP contexts and PPP connections on other interfaces (see also “ATH Manual rejection of a network
request for PDP context activation”).
• This command is not PIN protected;
• This command is not supported in airplane mode.
7.10 AT+CHUP Hang Up Call
Description: Cancels all active and held calls.
Syntax: Test Command: AT+CHUP=?
Responses: OK
ERROR
+CME ERROR: <err>
Exec Command: AT+CHUP
Responses: OK
ERROR
+CME ERROR: <err>
Notes:
• AT+CHUP implements the same behavior as ATH.
• This command is PIN protected;
• This command is not supported in airplane mode.
7.11 AT^SHUP Hang Up Call(s) Indicating a Specific
GSM04.08 Release Cause
Description: The write command serves to end one specific call or all calls known to the ME, indicating
a specific GSM04.08 release cause specified by the user. The command can be used for
voice and data calls in any call status (i.e., any calls listed by AT+CLCC).
Syntax: Test Command: AT^SHUP=?
Responses: OK
Write Command: AT^SHUP=<cause>[, <cn>]
Responses: ERROR
OK
Parameters:
<cause>
Release Cause
Release cause from GSM04.08 to be indicated to the network.
The Multi-Tech wireless modem will release the selected connection(s) with release cause indication “cause” and
location “user” (0) in the “disconnect” protocol message to the GSM Network. It depends on the network whether
or not the release cause will be forwarded to the remote party.
1 send GSM04.08 release cause “unassigned (unallocated) number”
16 send GSM04.08 release cause “Normal call clearing “
17 send GSM04.08 release cause “User busy “
18 send GSM04.08 release cause “No user responding “
27 send GSM04.08 release cause “Destination out of order “
31 send GSM04.08 release cause “Normal, unspecified”