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# ACEEX CORPORATION
ISDN-TA/MLP
Card Type ISDN TA
Chip Set Unidentified
I/O Options AC power, power switch, 26-pin serial
port, ISDN S/T interface (RJ-45)
analog telephone port (RJ-11),
ISDN Data Rate 128Kbps
ISDN Modulation V.110, V.120, X.75, HDLC, PPP, MLPPP
Protocol
Error MNP5, V.42bis
Correction/Compression
Data Bus External
IMG IMG 1
+------------------------------------------------------------+
| CONNECTIONS |
|------------------------------------------------------------|
| Function | Label | Function | Label |
|----------------------------+-------+---------------+-------|
| Analog telephone interface | CN1 | AC power | CN4 |
| (RJ-11 connector) | | | |
|----------------------------+-------+---------------+-------|
| ISDN S/T interface (RJ-45 | CN2 | Power switch | SW1 |
| connector) | | | |
|----------------------------+-------+---------------+-------|
| 25-pin serial port | CN3 | | |
|------------------------------------------------------------|
| Note: RJ-11 modular cable splits the analog telephone |
| interface (CN1) into two ports. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAGNOSTIC LED(S) |
|------------------------------------------------------------|
| LED | Color | Status | Condition |
|-----+--------------+----------+----------------------------|
| PR | Unidentified | On | Power is on |
|-----+--------------+----------+----------------------------|
| PR | Unidentified | Off | Power is off |
|-----+--------------+----------+----------------------------|
| SD | Unidentified | On | TA is transmitting data to |
| | | | a remote computer |
|-----+--------------+----------+----------------------------|
| SD | Unidentified | Off | TA is not transmitting |
| | | | data to a remote computer |
|-----+--------------+----------+----------------------------|
| RD | Unidentified | On | TA is receiving data from |
| | | | remote computer |
|-----+--------------+----------+----------------------------|
| RD | Unidentified | Off | TA is not receiving data |
| | | | from a remote computer |
|-----+--------------+----------+----------------------------|
| AA | Unidentified | On | Auto answer enabled |
|-----+--------------+----------+----------------------------|
| AA | Unidentified | Blinking | Phone is ringing |
|-----+--------------+----------+----------------------------|
| AA | Unidentified | Off | Auto answer disabled |
|-----+--------------+----------+----------------------------|
| A1 | Unidentified | On | Telephone port 1 is active |
|-----+--------------+----------+----------------------------|
| A1 | Unidentified | Blinking | Call is in progress on |
| | | | telephone port 1 |
|-----+--------------+----------+----------------------------|
| A1 | Unidentified | Off | Telephone port 1 is idle |
|-----+--------------+----------+----------------------------|
| A2 | Unidentified | On | Telephone port 2 is active |
|-----+--------------+----------+----------------------------|
| A2 | Unidentified | Blinking | Call is in progress on |
| | | | telephone port 2 |
|-----+--------------+----------+----------------------------|
| A2 | Unidentified | Off | Telephone port 2 is idle |
|-----+--------------+----------+----------------------------|
| LNK | Unidentified | On | ISDN S/T interface is |
| | | | active |
|-----+--------------+----------+----------------------------|
| LNK | Unidentified | Off | ISDN S/T interface is idle |
|-----+--------------+----------+----------------------------|
| 128 | Unidentified | On | MLPPP enabled |
|-----+--------------+----------+----------------------------|
| 128 | Unidentified | Off | MLPPP disabled |
+------------------------------------------------------------+
+---------------------------------------------------------+
| SUPPORTED COMMAND SET |
|---------------------------------------------------------|
| Basic AT Commands |
|---------------------------------------------------------|
| AT, A/ |
|---------------------------------------------------------|
| A, E, Q, V |
|---------------------------------------------------------|
| &C, &F, &R, &V, &Z |
|---------------------------------------------------------|
| S Registers |
|---------------------------------------------------------|
| S0, S2, S3, S4, S5, S12, S25, S26, S32, S33 |
|---------------------------------------------------------|
| |
|---------------------------------------------------------|
| Note: See MHI Help File for full command documentation. |
+---------------------------------------------------------+
Proprietary AT Command Set
+------------------------------------------------------------+
| CHAP NEGOTIATION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Pn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables/disables CHAP negotiation |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &P0 | CHAP negotiation enabled |
|--------------+---------------------------------------------|
| &P1 | CHAP negotiation disabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| COMMUNICATIONS MODE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Mn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects communications mode |
|--------------+---------------------------------------------|
| Command | Mode |
|--------------+---------------------------------------------|
| í&M0 | Asynchronous mode |
|--------------+---------------------------------------------|
| &M1 | Synchronous connect mode and asynchronous |
| | off-line command mode. |
|--------------+---------------------------------------------|
| &M2 | Synchronous connect mode |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA SET READY (DSR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Sn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects DSR options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &S0 | DSR forced high |
|--------------+---------------------------------------------|
| &S1 | DSR high only while modem is connected |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DATA TERMINAL READY (DTR) |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Dn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects modem response to DTR |
|------------------------------------------------------------|
| Command | Mode |
|---------------+--------------------------------------------|
| í&D2 | Abort connection on low DTR after time |
| | specified by register S25 |
+------------------------------------------------------------+
+------------------------------------------------------------+
| DIAL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] D<#> [cmds] |
|--------------+---------------------------------------------|
| Description: | Dials telephone number according to any |
| | modifiers included in the string |
|------------------------------------------------------------|
| Command | Function |
|----------------+-------------------------------------------|
| DT | Dials telephone number (same as ATD) |
|----------------+-------------------------------------------|
| DP | Dials telephone number (same as ATD) |
|----------------+-------------------------------------------|
| DS | Dial stored telephone number |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Kn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables flow control options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| &K0 | Flow control disabled |
|--------------+---------------------------------------------|
| í&K3 | RTS/CTS flow control enabled |
|--------------+---------------------------------------------|
| &K4 | XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| &K5 | Transparent XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| &K6 | RTS/CTS & XON/XOFF flow control enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| HOOK CONTROL |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Hn [cmds] |
|--------------+---------------------------------------------|
| Description: | Selects whether the modem is on-hook or |
| | off-hook |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| H0 | Modem commanded to go on-hook (hang-up) |
+------------------------------------------------------------+
+------------------------------------------------------------+
| ON-LINE |
|------------------------------------------------------------|
| Type: | Immediate |
|---------------+--------------------------------------------|
| Format: | AT [cmds] On [cmds] |
|---------------+--------------------------------------------|
| Description: | Controls on-line command (data |
| | transmission) state options. |
|------------------------------------------------------------|
| Note: The O command must be placed at the end of the |
| command string. |
|------------------------------------------------------------|
| Command | Function |
|---------------+--------------------------------------------|
| O0 | On-line command mode with no retraining |
| | enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| REPORT INFORMATION |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] In [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays information requested |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| I0 | Reports product identification |
|--------------+---------------------------------------------|
| I1 | Reports ROM checksum |
|--------------+---------------------------------------------|
| I3 | Reports model function |
|--------------+---------------------------------------------|
| I6 | Reports product name |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SELECT CALL PROGRESS RESULT CODES |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Xn [cmds] |
|--------------+---------------------------------------------|
| Description: | Enables selection of tone detection and |
| | associated result code format options |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| X0 | Base result codes only |
|--------------+---------------------------------------------|
| X1 | Extended result codes enabled |
|--------------+---------------------------------------------|
| X2 | Extended ISDN result codes enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| SOFT RESET |
|------------------------------------------------------------|
| Type: | Immediate |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Zn [cmds] |
|--------------+---------------------------------------------|
| Description: | Resets the active configuration to the |
| | stored configuration |
+------------------------------------------------------------+
+------------------------------------------------------------+
| STORE ACTIVE PROFILE |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] &Wn [cmds] |
|--------------+---------------------------------------------|
| Description: | Writes the values for the active profile |
| | into the non-volatile RAM |
+------------------------------------------------------------+
+------------------------------------------------------------+
| V.110 LINE SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] Fn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the maximum allowable data exchange |
| | rate for V.110 modulation |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| F0 | V.110 network baud rate follows DCE to a |
| | maximum of 38.4bps |
|--------------+---------------------------------------------|
| F1 | 300bps |
|--------------+---------------------------------------------|
| F2 | 1200bps |
|--------------+---------------------------------------------|
| F3 | 2400bps |
|--------------+---------------------------------------------|
| F4 | 4800bps |
|--------------+---------------------------------------------|
| F5 | 9600bps |
|--------------+---------------------------------------------|
| F6 | 19.2Kbps |
|--------------+---------------------------------------------|
| F7 | 38.4Kpbs |
+------------------------------------------------------------+
Special Commands
+------------------------------------------------------------+
| ISDN PROTOCOL SELECTION |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] !Z=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the B-channel protocol |
|------------------------------------------------------------|
| Command | Function |
|------------------+-----------------------------------------|
| !Z=5 | V.120 mode enabled |
|------------------+-----------------------------------------|
| !Z=6 | V.110 mode enabled |
|------------------+-----------------------------------------|
| !Z=9 | PPP/MLPPP mode enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| UART LINE SPEED |
|------------------------------------------------------------|
| Type: | Configuration |
|--------------+---------------------------------------------|
| Format: | AT [cmds] *Nn [cmds] |
|--------------+---------------------------------------------|
| Description: | Sets the fixed maximum allowable data |
| | exchange rate for UART |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| *NA | Autobaud enabled |
|--------------+---------------------------------------------|
| *N0 | 300bps |
|--------------+---------------------------------------------|
| *N1 | 1200bps |
|--------------+---------------------------------------------|
| *N2 | 2400bps |
|--------------+---------------------------------------------|
| *N3 | 4800bps |
|--------------+---------------------------------------------|
| *N4 | 9600bps |
|--------------+---------------------------------------------|
| *N5 | 19.2Kbps |
|--------------+---------------------------------------------|
| *N6 | 38.4Kpbs |
|--------------+---------------------------------------------|
| *N7 | 57.6Kbps |
|--------------+---------------------------------------------|
| *N8 | 76.8Kbps |
|--------------+---------------------------------------------|
| *N9 | 115.2Kbps |
|--------------+---------------------------------------------|
| *N10 | 7200bps |
|--------------+---------------------------------------------|
| *N11 | 14.4Kbps |
|--------------+---------------------------------------------|
| *N12 | 28.8Kbps |
|--------------+---------------------------------------------|
| *N13 | 38.4Kbps |
|--------------+---------------------------------------------|
| *N14 | 153.6Kbps |
+------------------------------------------------------------+
S(status) REGISTERS
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S14 |
|------------------------------------------------------------|
| Format: | AT [cmds] S14=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-174 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Controls extended baud rates, echo, result |
| | codes and display, dial mode, and |
| | answer/originate mode. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | 38.4Kbps extended baud rate enabled |
| | | |
| | 1 | 19.2Kbps extended baud rate enabled |
|------+-------+---------------------------------------------|
| 1 | 0 | Command echo disabled |
| | | |
| | 1 | Command echo enabled |
|------+-------+---------------------------------------------|
| 2 | 0 | Result codes enabled |
| | | |
| | 1 | Result codes disabled |
|------+-------+---------------------------------------------|
| 3 | 0 | Display result codes in numeric format |
| | | |
| | 1 | Display result codes in verbose format |
|------+-------+---------------------------------------------|
| 4 | 0 | Abort code on |
| | | |
| | 1 | Abort code off |
|------+-------+---------------------------------------------|
| 5 | 0 | Not used |
|------+-------+---------------------------------------------|
| 6 | 0 | Not used |
|------+-------+---------------------------------------------|
| 7 | 0 1 | Answer mode enabled |
| | | |
| | | Originate mode enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S21 |
|------------------------------------------------------------|
| Format | AT [cmds] S21=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-253 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Selects jack type, CTS/DCD/DSR signals, low |
| | DTR action, and the long space disconnect |
| | function. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 0 | 0 | Not used |
|------+-------+---------------------------------------------|
| 1 | 0 | Not used |
|------+-------+---------------------------------------------|
| 2 | 0 | CTS forced high |
| | | |
| | 1 | CTS follows RTS |
|------+-------+---------------------------------------------|
| 4, 3 | 00 | DTR signal ignored |
| | | |
| | 01 | Not used |
| | | |
| | 10 | Modem disconnects on low DTR; Auto-Answer |
| | | is disabled. |
|------+-------+---------------------------------------------|
| 5 | 0 | DCD forced high |
| | | |
| | 1 | DCD normal |
|------+-------+---------------------------------------------|
| 6 | 0 | DSR forced high |
| | | |
| | 1 | DSR normal |
|------+-------+---------------------------------------------|
| 7 | 0 | Not used |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S23 |
|------------------------------------------------------------|
| Format | AT [cmds] S23=n [cmds] |
|---------------+--------------------------------------------|
| Range: | 0-189 |
|---------------+--------------------------------------------|
| Unit: | Bit-mapped |
|---------------+--------------------------------------------|
| Description: | Controls rate and parity |
|---------------+--------------------------------------------|
| Bit | Value | Function |
|-------+-------+--------------------------------------------|
| 0 | 0 | Not used |
|-------+-------+--------------------------------------------|
| 3 - 1 | 000 | Sets serial port speed to 0-300bps |
| | | |
| | 001 | Extended baud rate sets enabled |
| | | |
| | 010 | Sets serial port speed to 1200bps |
| | | |
| | 011 | Sets serial port speed to 2400bps |
| | | |
| | 100 | Sets serial port speed to 4800bps |
| | | |
| | 101 | Sets serial port speed to 9600bps |
| | | |
| | 110 | Sets serial port speed to 19.2Kbps |
| | | |
| | 111 | Sets serial port speed to 38.4Kbps |
|-------+-------+--------------------------------------------|
| 5, 4 | 00 | Parity even |
| | | |
| | 01 | Space Parity |
| | | |
| | 10 | Parity odd |
| | | |
| | 11 | Mark or No Parity |
|-------+-------+--------------------------------------------|
| 7, 6 | 00 | Extended baud rate set to 57.6Kbps |
| | | |
| | 01 | Extended baud rate set to 78.4Kbps |
| | | |
| | 10 | Extended baud rate set to 115.2Kbps |
| | | |
| | 11 | Register S24 enabled for rate selection |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S24 |
|------------------------------------------------------------|
| Format | AT [cmds] S24=n [cmds] |
|---------------+--------------------------------------------|
| Range: | 0-189 |
|---------------+--------------------------------------------|
| Unit: | Bit-mapped |
|---------------+--------------------------------------------|
| Description: | Sets extra baud rates |
|---------------+--------------------------------------------|
| Bit | Value | Function |
|-------+-------+--------------------------------------------|
| 3 - 0 | 000 | 7200bps |
| | | |
| | 001 | 14.4Kbps |
| | | |
| | 010 | 28.8Kbps |
| | | |
| | 011 | 153.6Kbps |
| | | |
| | 100 | 230.4Kbps |
| | | |
| | 101 | 460.8Kbps |
| | | |
| | 110 | 921.6Kbps |
|-------+-------+--------------------------------------------|
| 6 - 4 | 0 | Not used |
|-------+-------+--------------------------------------------|
| 7 | 0 | Autobaud disabled |
| | | |
| | 1 | Autobaud enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S27 |
|------------------------------------------------------------|
| Format | AT [cmds] S27=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-111 |
|--------------+---------------------------------------------|
| Unit: | Bit-mapped |
|--------------+---------------------------------------------|
| Description: | Selects synchronous/asynchronous mode, line |
| | type, clock source, and ITU-T/Bell modes. |
|--------------+---------------------------------------------|
| Bit | Value | Function |
|------+-------+---------------------------------------------|
| 1, 0 | 00 | Asynchronous mode |
| | | |
| | 01 | Synchronous connect mode and asynchronous |
| | | off-line command mode |
| | 10 | |
| | | Synchronous connect mode |
| | 11 | |
| | | Synchronous connect mode |
|------+-------+---------------------------------------------|
| 2 | 0 | TA supports one number |
| | | |
| | 1 | TA supports multiple numbers |
|------+-------+---------------------------------------------|
| 3 | 0 | Not Used |
|------+-------+---------------------------------------------|
| 5, 4 | 00 | Local modem generates transmit clock source |
| | | |
| | 01 | Remote DCE/DTE generates transmit clock |
| | | source |
|------+-------+---------------------------------------------|
| 6, 7 | 0 | Not Used |
+------------------------------------------------------------+
+------------------------------------------------------------+
| BIT-MAPPED REGISTER S37 |
|------------------------------------------------------------|
| Type: | Register |
|---------------+--------------------------------------------|
| Format | AT [cmds] S37=n [cmds] |
|---------------+--------------------------------------------|
| Unit: | Bit-mapped |
|---------------+--------------------------------------------|
| Description: | Sets the maximum allowable data exchange |
| | rate for V.110 modulation |
|---------------+--------------------------------------------|
| Bit | Value | Function |
|---------------+--------------------------------------------|
| 3 - | 0000 | V.110 network baud rate follows DCE to |
| 0 | | maximum |
| | 0001 | |
| | | 300bps |
| | 0010 | |
| | | 1200bps |
| | 0011 | |
| | | 2400bps |
| | 0100 | |
| | | 4800bps |
| | 0101 | |
| | | 9600bps |
| | 0110 | |
| | | 19.2Kbps |
| | 0111 | |
| | | 38.4Kpbs |
|------+--------+--------------------------------------------|
| 7 - | 0 | Not Used |
| 4 | | |
+------------------------------------------------------------+
+------------------------------------------------------------+
| FLOW CONTROL |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S39=n [cmds] |
|--------------+---------------------------------------------|
| Description: | Displays the current flow control |
|--------------+---------------------------------------------|
| Value | Meaning |
|--------------+---------------------------------------------|
| 0 | Flow control disabled |
|--------------+---------------------------------------------|
| 3 | RTS/CTS flow control enabled |
|--------------+---------------------------------------------|
| 4 | XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| 5 | Transparent XON/XOFF flow control enabled |
|--------------+---------------------------------------------|
| 6 | RTS/CTS & XON/XOFF flow control enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| NO CARRIER TIME-OUT |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S40=n [cmds] |
|--------------+---------------------------------------------|
| Default: | 5 |
|--------------+---------------------------------------------|
| Range: | 1-60 |
|--------------+---------------------------------------------|
| Unit: | 1 second |
|--------------+---------------------------------------------|
| Description: | Maximum wait time the modem uses after |
| | dialing to detect a carrier signal from the |
| | remote modem for both originating and |
| | answering calls. |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RESULT CODES |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format: | AT [cmds] S22=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | ASCII |
|--------------+---------------------------------------------|
| Description: | Provides a "bit-map" of options for result |
| | code usage |
|--------------+---------------------------------------------|
| Command | Function |
|--------------+---------------------------------------------|
| S22=0 | Base result codes only |
|--------------+---------------------------------------------|
| S22=64 | Extended result codes enabled |
|--------------+---------------------------------------------|
| S22=112 | Extended ISDN result codes enabled |
+------------------------------------------------------------+
+------------------------------------------------------------+
| RING COUNT TIME OUT |
|------------------------------------------------------------|
| Type: | Register |
|--------------+---------------------------------------------|
| Format | AT [cmds] S54=n [cmds] |
|--------------+---------------------------------------------|
| Range: | 0-255 |
|--------------+---------------------------------------------|
| Unit: | 1 ring |
|--------------+---------------------------------------------|
| Description: | Sets the number of rings allowed before |
| | disconnect if auto answer is disabled. |
+------------------------------------------------------------+