Signal

This is the documentation of the generic JSON representation of innovaphone signaling messages. These messages are defined transport independent and are used inside different protocols implemented in the PBX, the Gateway or different Apps. These signaling messages can be mapped to SIP or H.323/EFC signaling.

{
    "type": "Signaling message type",
    "...": "more properties"
}

A property type identifies the signaling message. The names used here are based on the names defined in Q.931 ISDN signaling:

type

Type

• setup - Initiate a call
• accept - Call accepted on the local session, no signaling beyond this session
• info - Used to send more dialing info
• progress - Used to signal call progress information like presence ofin-band tones or announcements
• call_proc - Indicate that dialing information is complete
• alert - Indicate that the call is alerting at the sender of this message
• conn - The sender of this message accepts the call
• disc - The call is disconnected end to end, but local tones/announcements may be present
• rel - Release the call
• channels - Media negotition info sent independent of any signaling state change
• facility - Supplementary services signaling
• user_info - Transparent end to end user information
• media_info - Media status information

{
    "type": "setup",
    "bc": BearerCapability
    "cg": EP,
    "cd": EP,
    "complete": DialingComplete,
    "channel": Channel,
    "fty": [Fty,Fty, ...],
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
    "uui":UserUserInformation,
    "llc":LowerLayerCompatibility,
    "hlc":HigherLayerCompatibility,
    "pi":ProgressIndicator,
    "confId":ConferenceId,
    "callId":CallId,
    "dsp":Display
}

The setup message is used to start a call

{
    "type": "accept"
    "fty": [Fty,Fty, ...]
}

Used only together with some special supplementary services. See description there.

{
    "type": "accept"
    "cg": EP,
    "cd": EP,
    "complete": DialingComplete,
    "dsp":Display
}

The info message is used for additional dialing information after a setup_ack message is received or for additional information like charging display information when the call is connected.

{
    "type": "progress",
    "inband_info": InbandInfo,
    "cau":Cause
    "pi":ProgressIndicator,
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
}

Maps to the ISDN PROGRESS message. It is used to report, that in-band information is# available in the call. Together with a cau property present it indicates that the call was disconnected.

{
    "type": "call_proc",
    "inband_info": InbandInfo,
    "channel": Channel,
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
}

Maps to the ISDN PROGRESS message. It is used to report, that in-band information is# available in the call. Together with a cau property present it indicates that the call was disconnected.

{
    "type": "alert",
    "inband_info": InbandInfo,
    "pi":ProgressIndicator,
    "fty": [Fty,Fty, ...],
    "channel": Channel,
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
}

Indicates that the called endpoint is alerting.

{
    "type": "conn",
    "uui":UserUserInformation,
    "dsp":Display
    "fty": [Fty,Fty, ...],
    "channel": Channel,
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
}

Indicates that the called endpoint has connected the call.

{
    "type": "disc",
    "inband_info": InbandInfo,
    "cau":Cause
    "pi":ProgressIndicator,
    "uui":UserUserInformation,
    "dsp":Display
    "fty": [Fty,Fty, ...],
}

Sent by a network component to indicate that the remote endpoint has disconnected the call, but still inband information may be available

{
    "type": "rel",
    "cau":Cause
    "uui":UserUserInformation,
    "dsp":Display
    "fty": [Fty,Fty, ...],
}

Releases the call.

{
    "type": "channels",
    "channel": Channel,
    "channels_cmd": ChannelsCmd,
    "channels":Channels,
    "faststart":Faststart,
}

Message used for media negotiation, if the information cannot be transported with another signaling message

{
    "type": "facility",
    "fty": [Fty,Fty, ...],
}

Used for facility objects if no other signaling message can be used.

{
    "type": "user_info",
    "uui":UserUserInformation,
}

Used for transparent user user information when a call is connected.

The ISDN Bearer Compatibility Information element as hex string. If not set an appropriate value has to be chosen for the Bearer Capability when sending the call to ISDN, based on channel. For calls without media channel (channel=0), a value of "a880" for calls with media channel a value of "8090a2" is recommended.

The H.323 callIdentifier. This identifies a single leg of a call.

{
    "loc": "Location",
    "num": "Cause"
}

The ISDN Cause information element. Used to report error conditions or the reason why a call was disconnected.

loc

The location of the cause as defined in Q.931

num

The cause number as defined in Q.931

Integer value indicating the channel used for a call. For calls without media a value of 0 is used. For VOIP calls with media a value of -1 is used.

A boolean value, indicating that no more dialing information will be sent.

The H.323 conferenceID. This id is the same for all legs of a call.

{
    "procedure": Diversion Procedure,
    "remote_enabled": boolean
    "served": EP
    "diverted_to": EP
}

procedure

The diversion procedure

remote_enabled

True if enabled by endpoint

served

The endpoint which is diverted

diverted_to

The destination of the diversion

A string value identifying a call diversion procedure

{
    "num": "phone number",
    "sip": "sip uri"
}

The EP object is used in general to address the endpoint of a call. The endpoint may be addressed by a phone number or by a sip uri.

num

A phone number as used on the PSTN. It may consist of dialing digits ("0" ... "9", "*", "#") and the following prefixes:

R	Presentation Restricted number, which means this number should not be forward out of the system
S	Subscriber number
N	National number
I	International number

sip

A sip URI. If the call is to/from the local domain only the user part is used.

An array of FacilityObjects.

The ISDN Higher Layer Compatibility Information element as hex string. Only used together with ISDN signaling.

Boolean value, which indicates that inband info is availabe in the call.

The ISDN Lower Layer Compatibility Information element as hex string. Only used together with ISDN signaling.

Array of hex strings of ISDN Progress Indicator information elements. The hexstrings do not include the type and length field of the information elements. Only used together with ISDN signaling.

Defines the current activity. Allowed values are:

The contact URI defines where this presence information originates from. New presence information only overwrites the presence from the same contact URI. The following contact URIs are used by innovaphone

A note entered by the user

The status of the user in respect to the contact URI. This indicates if the device of the user with this contact URI is active. Allowed values are "open", "closed".

A string value defining a remote control operation. The following values are defined:

The ISDN/H.323 User User Information as string. The protocol discriminator is not included and is assumed as hex 50. A maximimum length of 128 bytes is allowed.

{
    "type": "Type of Facility element",
    "...": "more properties"
}

Depending on the value of the type property, different objects are defined. The following types are defined:

{
    "type": "ct_identify"
}

For a call transfer of two active calls, with this facility an id is requested from one active calls, which is sent to with ct_initiate to the other call.

{
    "type": "ct_identify_result",
    "id": unsigned id
    "dst": EP
}

return the id requested by ct_identify

{
    "type": "ct_initiate",
    "id": unsigned id
    "dst": EP
}

Initiate a call transfer, either to the other active call, which is identified by id, or if id is not found to a new call to dst

{
    "type": "ct_initiate_result",
    "error": unsigned error code
    "cause": isdn cause code
}

Send when the call transfer is complete. This is either when it failed, then error is set and if available cause, or when it succeeded. For a blind transfer (no id), the transfer succeeded, when a call_proc, alert or conn from the new call is received

{
    "type": "ct_setup",
    "id": unsigned id
    "dst": EP
}

Send with a new call created by a call transfer. id is the id sent with ct_initiate. dst identifies the endpoint which sent the ct_initiate

{
    "type": "ct_setup_result",
}

May be sent in response to ct_setup. No real meaning.

{
    "type": "ct_complete",
    "remote": EP
    "remote_name": Remote Name Id,
    "call_status": State of call,
    "end":
}

Send to transferd endpoints to announce the new endpoint to which they are connected. call_status and end are not used.

{
    "type": "diversion_interrogate",
    "procedure": Diversion Procedure
    "served": EP
    "interrogating": EP
}

Used to interrogate the PBX for set call diversions.

procedure

The procedure, which shall be interrogated

served

Optional the endpoint which is interrogated. Does not work for any other then the interrogating endpoint on innovaphone PBX

interrogating

Optional the endpoint interrogating

{
    "type": "diversion_interrogate_result",
    "procedure": Diversion Procedure,
    "error": error code if interrogate failed
    "num": number of entries
    "list": [Diversion Entry]
}

Returns a list of diversions

{
    "type": "diversion_callreroute",
    "last_rerouting": EP,
    "called": EP,
    "calling": EP,
    "served": EP,
    "reason": Diversion Procedure
}

Request the rerouting of the call

called

Destination to the call is rerouted

last_rerouting, calling, served

Only used innovaphone PBX internally

{
    "type": "diversion_calldeflection"
}

Not implemented

{
    "type": "diverting_leg1",
    "reason": Diversion Procedure
    "nominated": EP,
    "redirecting": EP,
}

Send to the caller of an diverted call, when a diversion is performed

nominated

the new destination of the call

redirecting

the endpoint which initiated the diversion

{
    "type": "diverting_leg2",
    "diverting": EP,
    "original_called": EP,
    "diverting_name": String,
    "original_called_name": String
}

Send with the call to the new destination of the diversion

diverting

The endpoint performing the last diversion

original_called

The original called endpoint, only present if there is more then one diversion

{
    "type": "diverting_leg3",
    "redirection": EP,
}

Sent to the caller of the diverted call, with the conn message

{
    "type": "diverting_leg4",
    "reason": Diversion Procedure,
    "nominated": EP,
    "redirecting": EP
}

On innovaphone PBX this message is only used to inform an endpoint about update of configured diversions, by sending this message without reason, nominated or redirecting property.

{
    "type": "hold_notify"
}

Informs the endpoint that the peer endpoint of the call has initiated a hold

{
    "type": "retrieve_notify"
}

Informs the endpoint that the peer endpoint of the call has initiated a retrieve

{
    "type": "remote_hold",
}

Request the call to be held

{
    "type": "remote_hold_result"
}

No real meaning, hold does not fail

{
    "type": "remote_retrieve"
}

Request a held call to be retrieved

{
    "type": "remote_retrieve_result"
}

No real meaning, retrieve does not fail

{
    "type": "cp_park",
    "parking": EP,
    "parked": EP,
    "parked_to": EP,
    "park_position": unsigned
}

Used to park a call at a new destination. If initiated by an endpoint only parked_to is used to address the new endpoint

{
    "type": "cp_group_indication_on",
    "callId": CallId
    "member": EP,
    "parked_calling": EP,
    "parked_to_alerting": EP,
    "parked_to_alerting_ext": EP,
    "park_position": unsigned,
    "inbound_call": bool,
    "duration": unsigned,
    "name_id_calling": string,
    "name_id_alerting": string,
    "sig_call_state": unsigned
}

This object is used on configured group indication to announce a call that may be picked. This can either be a parked or an alerting call. On dialog sibscription calls, this object is used for any active calls at the monitored destination

callId

CallIdentifier of the call

member

The monitored endpoint

parked_calling

Identifies the endpoint which was calling for parked or alerting calls, or in general the remote end of the call

parked_to_alerting

The local end of the call. Typlically identical to member

park_position

Park position if the is a parked call, which was parked to a position

inbound_call

True if is a call initiated by the parked_to_alerting endpoint, which means it is the other call direction, as would be an alerting call.

duration

Duration of the call in seconds

name_id_calling

Name Id to parked_calling

name_id_alerzing

Name Id to parked_to_alerting

sig_call_state

innovaphone call state definition

{
    "type": "cp_group_indication_off",
    "callId": CallId,
    "member": EP,
    "clear_all": bool
}

On configured group indications, this message indicates, that the call is not in a state anymore in which it can be picked. For dialog subscriptions this message is sent, when the call was released.

callId

CallIdentifier of the call

member

The monitored endpoint

clear_all

All calls of the monitored endpoint are not monitored anymore

{
    "type": "cp_pick_req",
    "callId": CallId,
    "picking": EP,
    "parked_calling": EP,
    "parked_to_alerting": EP,
    "park_position": unsigned
}

Send in a setup message of a no media call to request to pick a call. If successful the picked call will be sent with the facility pick_exe to the picking endpoint

callId

CallIdentifier, if a specific call shall be picked

picking

The picking endpoint, which may not be any other then the originator of the pickup call

parked_calling

Optionally the remote endpoint of the picked call to identify the call

parked_to_alerting

Endpoint where the call is picked

park_position

Identify the position if only a call parked to a given position is to be picked

{
    "type": "cp_pick_exe",
    "callId": CallId,
    "picking": EP,
    "parked_calling": EP
}

Sent with the setup of a picked call

callId

CallIdentifier of the picked call

picking

Endpoint requesting the picking

parked_calling

The endpoint from where the call was picked

{
    "type": "call_waiting"
}

Included in a alert message if the call is waiting, which means another call is currently active at the called endpoint

{
    "type": "mwi_activate",
    "served_user": EP,
    "message_center": EP,
    "originating_user": EP,
    "time": string,
    "service": unsigned,
    "number": unsigned,
    "priority"
}

Send in a setup of a no media call to activate message waiting indication

{
    "type": "mwi_deactivate",
    "served_user": EP,
    "message_center": EP,
    "service": unsigned,
    "call_back": unsigned
}

Send in a setup of a no media call to deactivate a message waiting indication

{
    "type": "mwi_interrogate",
    "served_user": EP,
    "message_center": EP,
    "service": unsigned,
    "call_back": unsigned
}

Send in a setup of a no media call to interrogate active message waiting indications.

{
    "type": "mwi_interrogate_result",
    "sub": mwi_activate
}

Returns last mwi_activate

{
    "type": "name_identification",
    "name": string
}

Included in setup, alert or conn messages to indicate the display name of the sender

{
    "type": "co_alerting"
}

?

{
    "type": "presence_publish",
    "status": Presence Status,
    "activity": Presence Activity,
    "note": Presence Note,
    "contact": Presence Contact
}

This object is sent in a setup message of a no media call to publish a presence item

{
    "type": "presence_subscribe"
}

This object is included in the setup message of a no media call to indicate, that this is a presence subscription

{
    "type": "presence_notify",
    "status": Presence Status,
    "activity": Presence Activity,
    "note": Presence Note,
    "contact": Presence Contact
}

This object is sent in a facility message of a presence subscription call to indicate the current presence status.

{
    "type": "dialog_info_subscribe"
}

This object is included in the setup message of a no media call to indicate, that this is a dialog info subscription. The dialog information is then sent with cp_group_indication objects in facility messages.

{
    "type": "im_setup"
}

This object is included in the setup message of a no media call to indicate, that this is a instant messaging (chat) call.

{
    "type": "im_message",
    "sender": string,
    "sender_dn": string,
    "subject": string,
    "participants": string,
    "data"; string,
    "attach": string,
    "typing": bool,
    "mime": string,
    "more": bool
}

This object is sent with a facility message within a instant messging call to transmit chat messages

sender

SIP URI of the sender of the message

sender_dn

Display name of the sender

subject

A subject line of the message

participants

Comma separated list of participants in a group chat (not supported anymore)

data

The message data formated according the mime type

typing

True if sender is typing

mime

The mime type of the message. It is recommended to use html

more

true if the data of the message is not complete and more data follows in more messages

{
    "type": "cli_override"
}

If present in a call the PBX uses the calling line identification from the setup instead of replacing it by what is defined for the endpoint.

{
    "type": "innovaphone_remote_control",
    "control": Remote Control,
    "digit": string
}

Maybe sent in signaling messages to perform remote control operations at the phone. Some operations may use digit as argument.

The channels_cmd property implements the SIP offer/answer as the H.323EFC Proposal/Select procedure. The basic idea is, that one side sends an offer for media descriptions (proposal) and the other side chooses supported media descriptions and sends these back as answer (select).

In addition to this basic procedure, media can be closed or one side can request an new offer from the other side.

This result in the following string values for the channels_cmd property:

{
    "source": Source,
    "id": Id,
    "guid": GUID,
    "key":Key,

    "audio_rtcp_mux":Audio RTCP multiplxing,
    "t38_rtcp_mux":T.38 RTCP multiplxing,
    "video_rtcp_mux":Video RTCP multiplxing,
    "collab_rtcp_mux":Collab RTCP multiplxing,

    "audio_setup_role":Audio Setup Role,
    "t38_setup_role":T.38 Setup Role,
    "video_setup_role":Video Setup Role,
    "collab_setup_role":Collab Setup Role,

    "audio_ice":Audio ICE,
    "t38_ice":T.38 ICE,
    "video_ice":Video ICE,
    "collab_ice":Collab ICE,

    "ch":[Channel,...]
}

The Channels object is a complete media description for the call. Together with a channels_cmd of "PROPOSAL", it is a media offer (proposal) and together with a channels_cmd of "SELECT" it is a media answer (select).

This is a string defining the source of the media channels. Based on the source different modes of operations may be used in signaling entities. The following values are defined:

An unsigned integer, as id of the channels (???/tac)

A hex string for a 16 bytes GUID, which identifies the system from which these channels originate. If this is forwared to the other end of the call it is used to detect if the call is terminated on the same system again, so that a local PCM connection may be switched.

{
    "tag": SRTP tag as unsigned integer,
    "mode": SRTP Mode,
    "mki": MKI,
    "mki_len": MKI length,
    "b": hexstring of SRTP key,
}

The SRTP key used for the audio channel, in case no DTLS can be done.

Boolean value indicating the RTCP multiplexing can be done, meaning that RTP and RTCP is sent on the same UDP port. The side sending the offer can set this value to true if it supports RTCP multiplexing. The side sending the answer may send back a value of true in this case to turn on RTCP multiplexing.

This string property may be added, if not the default ICE setup role shall be used, which is defined by who is sending the offer and who the answer.

The following values are defined:

{
    "lite": Only ICE lite support,
    "fingerprint": ICE fingerprint as hexstring,
    "usr": ICE authentication user,
    "pwd": ICE authentication password,
    "candidate": [Candidate, ...],
}

The ICE parameters for the respective channel

{
    "addr": address,
    "r_addr": ???/msc,
    "rtp": ?,
    "rtcp": ?,
    "r_rtp": ?,
    "r_rtcp": ?,
    "rtp_prio": ?,
    "rtcp_prio": ?,
    "type": ?,
    "foundation": ?
}

The ICE candiates, which where locally found and transmitted to the other side, so that ICE testing can find a matching pair.

{
    "coder": Coder,
    "number": Number ???/tac,
    "xmit": xmit,
    "rate": recv,
    "addr": Media address,
    "port": Media Port,
    "mc_addr": Multicast address,
    "mc_port": Multicast port,
    "pt": Payload type,
    "flags": Flags
}

Coder

The coder used for this media channel. The following Coder values are defined:

G711A	G.711 A-Law
G711u	G.711 u-Law
G723-53	G.723 using low bitrate
G723-63	G.723 using high bitrate
G729	G.729
G729A	G.729 reduced complexity
G729B	G.729 including comfort noice updates
G729AB	G.729 reduced complexity, with comfort noice upüdates
T38UDP	T.38 Fax
G722	G.722
XPARENT	Bit transparent coder
H264	H.264 Video
JRFB	Innovaphone Json Remote Frame Buffer protocol for application sharing
OPUS-NB	Opus narrow band
OPUS-WB	Opus wide band
VPB	VP8 Video

Number

?

xmit

Packetization for transmitting in ms. With the offer a proposed value is sent, which may be reduced in the answer.

recv

Packetization for receiving in ms. With the offer a proposed value is sent, which may be reduced in the answer.

addr/port

Transport address to receive media. This is the RTP port. The RTCP port is assumed to be port+1

mc_addr/port

Multicast address if the the media is to be sent to a multicast address.

pt

The payload type if not the default payload types are used, or if not default payload type is defined for the coder

flags

?

Array of H.323 faststart elements, coded as hex strings.