DIP

DIP is the control protocol used between Stentofon IP stations and AlphaCom E exchanges. It is used for all data-communication with the IP stations, such as call control, LED settings and display text to the station, and key presses and inputs from the station.

DIP is short for "Display-data over IP", and refers to the ASLT display data protocol. This protocol was based on 9600 baud one-way transmission while DIP is transmitted both ways over IP (TCP and UDP).

The commands are written as human readable text.

Maximum DIP message length: 500 bytes.
Command parameters are separated by space (0x20). 
Number values is coded as hex. Exception is IP adresses with dot notation 10.5.2.3.
Text strings are enclosed by quotes "".  
Text strings containing " are code as \"
Text constants without space can be coded without " (stu)

See also IP Station Audio Interface for more information on how the audio streams are set up to IP stations using DIP.

Protocol specification

AlphaCom side TCP port: 50001.
Station side TCP port: (Any).
Station side UDP port: (Specified in con command).

AlphaCom listens for IP stations on TCP port 50001. When an IP station is powered up, it connects to this port and sends the stu command to AlphaCom. AlphaCom then specifies UDP voice ports and optionally UDP command port with the con command.

DIP Commands

Current version: 00.04.

Commands from AlphaCom to IP stations:

con - Configure station

<ref> con <phy_ind> <dirno> <name> <volume> <port0> <pri0> <port1> <pri1> <port2> <pri2> ...
       <port_udp> <mcast-ip> <mac-addr> 
Example: 
    008 con 8 "2310    " "IP Station  " 6 EE48 2 EE4A 3 EE4C 1 C351 239.192.101.0 0013cb0006ac

The con command is sent from AlphaCom once during startup, after the station has reported with the stu command. It may also be sent after AlphaCom database configuration changes.

ref: Physical number for addressed station.

phy_ind: Physical number of the station. This number specifies the ref parameter values used in all later commands for identifying this station.

dirno: Text info for showing on station's display and web-page.

name: Text info for showing on station's display and web-page.

volume: Volume level for the station. Hex value 00-1F.

port0: UDP port for voice logical-channel 0.

pri0: Priority for voice logical-channel 0.

port1: UDP port for voice logical-channel 1.

pri1: Priority for voice logical-channel 1.

port2: UDP port for voice logical-channel 2.

pri2: Priority for voice logical-channel 2.

port_udp: UDP port for DIP commands over UDP multicast (since AMCD 10.20).

mcast-ip: Multicast address for DIP commands over UDP multicast (since AMCD 10.20).

mac-addr: MAC address of AlphaCom. Use to sort out "agc"/"age" messages received on multicast (since AMCD 10.23).

auc - Audio Connect

<ref> auc  <port> <codec> <packetlen> <volume> <config-bitmap>

ref: Physical number for addressed station.

amc-ip: Remote IP address for voice stream.

port: Remote UDP port for voice stream.

Hex value 0000-FFFF.

codec:

g711

g722

packetlen:

Hex value 0A (10ms), 14 (20ms).

volume:

Hex value 00-1F.

config-bitmap:

0001 = Use station's Echo canceler for open duplex conversation.

0002 = Send Only/simplex: Send mic audio to given address, mute speaker, no echo cancel.

aue - Audio End

<ref> aue

ref: Physical number for addressed station.

agc - Audio Group Connect

<ref> agc <logical-chan> <op> <mcast-ip> <codec> <group-bitmap> <mac-addr> <config-bitmap>

The agc command is sent over TCP (unicast) or UDP (multicast). It may come either from AlphaCom or from a forwarding IP station. Since it may be sent over unreliable UDP protocol it is repeated by the sender each 5th second. If the first message is lost, the next will probably come through.

ref: Physical number for addressed station.

logical-chan: Channel number for UDP voice. The channels' ports are previously congfigured by the con command.

1 = group call

2 = program distribution

op:

lst - Receive multicast and playout

fwd - Receive unicast, forward to multicast and playout

mcast-ip: Multicast IP for the group voice.

codec:

g711

g722

group-bitmap: Optional, variable length. Stations addressed by this multicast message in addition to the one addressed by ref.

Hex value. 0-FFFFF... One bit per station selected. '1' value in position N means station with physical no = N + ref is included. Example: ref=3, bitmap=81 means that phys. no 3, 4 and 11 are included.

(Since AMCD 10.23, always present, empty group is a single "0")

mac-addr: MAC address of AlphaCom, should match MAC address received in "con" message. Since AMCD 10.23.

config-bitmap:

0001 = Handset and volume override on station for this call.(AMCD 10.23)

age - Audio Group End

<ref> age <logical-chan> <op> <group-bitmap> <mac-addr> 

The age command is sent over TCP (unicast) or UDP (multicast). It may come either from AlphaCom or from a forwarding IP station. Since it may be sent over unreliable UDP protocol it may not be received, and the IP station should have implemented a timeout mechanism to simulate the age command if the expected repetition of agc commands is missing for a long time.

ref: Physical number for addressed station.

logical-chan: Same as for agc command.

op: Same as for agc command.

group-bitmap: Same as for agc command.

mac-addr: MAC address of AlphaCom, should match MAC address received in "con" message. Since AMCD 10.23.

bon - Volume-boost on

<ref> bon

ref: Physical number for addressed station.

bof - Volume-boost off

<ref> bof

ref: Physical number for addressed station.

ind stl - Set StationLED indicator

<ref> ind stl <remindertype> <onoff>

ref: Physical number for addressed station.

remindertype:

0 = static

1 = blink each 4th second (mail notification)

2 = blink each 1 second (priority mail notification)

onoff:

0 = off

1 = on

ind dak - Set DAKLED indicator

<ref> ind dak <no> <indno> <blinktype> <onoff>

ref: Physical number for addressed station.

no:

Hex value. 0-FFFE.

0 = DAK 1.

indno:

0 = Indno 0.

FFFF = Special: Set all DAK indicators off.

blinktype:

0 = static.

1 = slow blink.

2 = fast blink.

onoff:

0 = off

1 = on

ind out - Set Output indicator

<ref> ind out <no> <indno> <blinktype> <onoff>

ref: Physical number for addressed station.

no:

Hex value. 0-FFFE.

0 = Output 1. (On IP substation this is the Relay output).

1 = Output 2. (On IP substation this is the Spare output).

FFFF = Special: Set all output indicators off.

indno:

0 = Indno 0. (On IP substation this is the only valid indno).

blinktype:

0 = static.

1 = slow blink.

2 = fast blink.

onoff:

0 = off

1 = on

tone - Output tone

<ref> tone <frequency> <volume> <on_len> <off_len> <on_duration> <off_duration> 

ref: Physical number for addressed station.

frequency:

0 = Turn off tone.

1 -> = Frequency in Hz

volume: Volume for the tone. Independent of station's normal audio volume.

Hex value 00-1F.

on_len: On-length to play the tone. 1ms resolution.

Hex value 0-FFF (4 sec max)

0 -> = length in 1 ms resolution.

off_len: Off-length to mute the tone. 1ms resolution.

Hex value 0-FFF (4 sec max)

0 = Play the tone continuously. (Note: Value for on_len doesn't matter.)

1 -> = length in 1 ms resolution.

on_duration: On-duration to play the on_len/off_len pattern.

Hex value 0-28F4 (1048 sec max)

0 = endless

1 -> = duration in 100 ms resolution.

off_duration: Off-duration to mute the on_len/off_len pattern.

Hex value 0-28F4 (1048 sec max)

0 = Play the pattern for on_duration time, then stop.

1 -> = duration in 100 ms resolution.

bleep - Bleep (obsolete)

<ref> bleep <type> <duration on> <duration off> <volume> 

ref: Physical number for addressed station.

type:

0 = No tone (Turn off)

1 = 500Hz

2 = 400Hz

3 = xxx

4 = xxx

5 = Configurable 1

6 = Configurable 2

7 = Configurable 3

8 = Configurable 4

duration on:

1 -> = duration in 100 ms resolution

duration off:

1 -> = duration in 100 ms resolution

volume

Hex value 00-1F.

vol - Set station volume

<ref> vol <volume> 

ref: Physical number for addressed station.

volume

Hex value 00-1F.

ping - Ping

<ref> ping

ref: Physical number for addressed station.

mping - Multicast Ping

<ref> mping <op> <mac_addr> 

ref: Physical number for addressed station, which is supposed to reply with mpong.

op:

lst - Receiver should reply with mpong

fwd - Receive unicast, forward to multicast

mac_addr: MAC address of AlphaCom. Should match the MAC address given in the "con" message.

AlphaCom tests that stations configured for multicast / relayed multicast, can be reached with multicast DIP messages. The mpong message is transmitted following the same rules as the "agc" and "age" message, except that a mping message only addresses one single station.

This test does not test for RTP reachability, see "err rtp" message for that.

Display Text Support (Under construction)

The first implementation is based on the TouchLine (TL) display text output from AlphaCom converted to DIP. <br\> (A later version might be based on HTML pages for extended graphical features.)

TL -> DIP changes
For DIP clarity the original TL protocol control characters is replaced with separate DIP commands.
For language support the text is coded in UTF-8

dite - Display a line of text on specified line and position

<ref> dite <disp> <line> <pos> <text>

ref: Physical number for addressed station.

disp: Display number. ( 1 is main display, 2 is DAK display)

line: Line number. ( 1 - 4 for main display, 1 - 100 for DAK display )

pos: Position on the line.( 1 - 20 )

text: Display text coded as UTF-8

dicls - Clear the display

<ref> dicls <disp> 

(Parameters as described for dite)

dicb - Start cursor blink at a specified position.

<ref> dicls <disp> <line> <pos>

(Parameters as described for dite)

dici - Cursor invisible.

<ref> dicls <disp> 

(Parameters as described for dite)

dicmd - Send User Defined Command ($DSPL)

<ref> dicmd <payload> 

ref: Physical number for addressed station.

payload: User defined array 0 - 50 bytes (HEX coded)

All commands sent by the $DSPL DP command not related to the ToutchLine display control are tunneled to the dicmd message.<br\> Display Commands not forwarded:<br\>

0x00 -> 0x43 
0x50 -> 0x5F 
0xF0 -> 0xFF 

Example:

$DSPL L101 U4 60AB0812
1 dicmd 60AB0812
Send user defined command to station 1 with 4 bytes of payload (firt byte is command).

Commands from IP stations to AlphaCom:

stu - Station Up

<ref> stu <mac_addr> <ip> <dip_version> <sw_type> <sw_version> <hw_type> <hw_version>
Example: 1 stu 0013cb00086c 10.5.101.48 00.02 A100G80222 01.01 8022 1

This message is sent from IP station to AlphaCom once the TCP connection is established.

ref: Physical number of the sending station.

mac_addr: MAC address of the IP station.

Format: 001122334455

ip: IP address of the IP station.

dip_version: DIP protocol version number used by IP station.

Format: XX.XX (decimal).

sw_type:

A100G80222 - IP substation software

sw_version:

Format: XX.XX (decimal).

hw_type:

8021 - IP substation, old type (without RJ connectors).

8022 - IP substation.

hw_version:

Format: X (decimal).

evt inp - Station Input Event

<ref> evt inp <no> <onoff>

ref: Physical number of the sending station.

no: Input no as specified by IP station hardware.

0 = Input 1. (Key input 1 on IP substation).

1 = Input 2. (Key input 2 on IP substation).

2 = Input 3. (Key input 3 on IP substation).

onoff:

0 = off

1 = on

evt key - Station Key Event

<ref> evt key <no> <onoff>

ref: Physical number of the sending station.

no: Key no.

0-9 = digits 0-9.

0A = * (TODO: Verify this!)

0B = # (TODO: Verify this!)

(TODO: Add more key definitions for menu control keys here?)

onoff:

0 = off

1 = on

evt mkey - Station M-key Event

<ref> evt mkey <onoff>

ref: Physical number of the sending station.

onoff:

0 = off

1 = on

evt ckey - Station C-key Event

<ref> evt ckey <onoff>

ref: Physical number of the sending station.

onoff:

0 = off

1 = on

evt dak - Station DAK key Event

<ref> evt dak <no> <onoff>

ref: Physical number of the sending station.

no: DAK key no.

0-... = DAK key 0-....

onoff:

0 = off

1 = on

evt hooksw - Station Hookswitch Event

<ref> evt hooksw <onoff>

ref: Physical number of the sending station.

onoff:

0 = off (lifting the handset, going lowspeaking)

1 = on (replacing the handset, going loudspeaking)

pong - Pong

<ref> pong

ref: Physical number of the sending station.

mpong - Multicast Pong

<ref> mpong

ref: Physical number of the sending station.

Reply to the mping supervision message.

ack - Ack

<ref> ack <params...>

Ack is sent as response to sucessful command from AlphaCom. Parameters depend on the command that was received.

ref: Physical number of the sending station.

nak - Nak

<ref> nak <params...>

Nak is sent as response to unsucessful command from AlphaCom. Parameters depend on the command that was received.

ref: Physical number of the sending station.

err rto - RTP audio missing

<ref> err rtp <channel>

channel: IP Station Audio Interface#Logical channels.

"err rtp 0" means that a "auc" message was received, but no RTP audio followed. "err rtp 1" / "err rtp 2" means that a "agc" message was received and matched, but no RTP audio followed. IP stations delay sending of "err rtp" for 2 - 7 seconds after auc/agc to spread traffic load.