DS0 Status Change 0x0042

This message informs the host of the current status of the channel specified. It is sent when the status of a channel has changed. All host applications must be designed to handle this message for out-of-service and in-service conditions.

To extract the span and channel in the C version of the API, you need to use the following code:

printf("DS0 Stat Change, Span:%d, Chan:%d, Purge:%X\n",
sk_getAIBSpan(ds0->AddrInfo),

If the Channel Status is 0x00 (Purge), consult the table below for the Purge Reason and corrective action. Otherwise, this field is 0x00.

Range of channels provided by T1 or E1 transmission service. A physical span is a group of channels taking up a single physical wire. A logical span is a group of channels taking up less than a single logical wire, or carried over more than one physical wire.

A group of data bits in a specific format, with a flag at each end to indicate the beginning and the end of the frame.

See Address Information Block.

A type of diagnostic test in which the transmitted signal is returned to the sending device after passing through a data communications link or network.

Outgoing call setup during real-time call processing on a specific channel.

Positive acknowledgment to a message

Call processing layer of the CSP.

Protocol layer of the CSP.

See Programmable Protocol Language.

In PPL, a condition that, when met, drives a state machine (PPL Component) from one state to another, by invoking an associated Primitive. In PPL files, an Event is marked by an arrow and text.

The condition of a component at a given instant. The current "context" of a PPL object, such as Idle, Seizing, Answered. In PPL files, a State is represented by a circle.

Internet Protocol. Part of the TCP/IP family of protocols used to route messages and tracks the addresses of nodes.

Session-Initiation Protocol. A signaling protocol used for establishing sessions in an IP network. A session could be a simple, two-way telephone call, or it could be a collaborative multi-media conference session.

See Integrated Services Digital Network.

Digital Signal Processor

Excel's open architecture, proprietary, 1.3 Gbps fiber optic network using a packet-based protocol.

A digital communications link - voice, data, and video at a 2.048 Mbps rate; 30B/2D or 31B/1D (ISDN); non-North American version of T1.

Momentary interruption in a single frequency tone indicating the distant switch is ready to receive the digits just dialed.

See Information Control Block.

A computer, attached to the Excel platform through an RS-232 or Ethernet link, from which you run the telecommunications application that controls the Excel platform.

See Automatic Number Identification.

Incoming call setup during real time call processing on a specific channel.

See Integrated Services Digital Network User Part.

Network Protocol Data Intelligence. Also called “Interworking,” it is a software product that operates within Excel’s Call Control (Layer 4) and Services (Layer 5) call processing layers. NPDI is meant to enhance Excel’s call processing product offering by allowing call processing layers (specifically Layers 4 and 5) to perform advanced analysis, generation, and conversion of Network Signaling (NS) Layer 3 information.

MESSAGE (White)		RESPONSE (Gray)
Byte	Field Description	Byte	Field Description
0	Frame (0xFE)	0	Frame (0xFE)
1, 2	Length (0x00NN)	1, 2	Length (0x0005)
3, 4	Message Type (0x0042)	3, 4	Message Type (0x0042)
5	Reserved (0x00)	5	Reserved (0x00)
6	Sequence Number	6	Same Sequence Number
7	Logical Node ID	7	Logical Node ID
:	AIB Address Method 0x00 - Individual AEs or for Line Card Busy: 0x01 - Range of AEs	8	Checksum
	Number of AEs to follow
	AEs 0x0D Channel or 0x0D Channel (Starting) 0x0D Channel (Ending)
:	Channel Status 0x00 Purge 0x01 Out of Service 0x02 In Service 0x03 Reserved 0x04 Parked 0x05 Blocked 0x06 Unblocked 0x07 Out-of-Service Maintenance Loopback
:	Purge Reason (See table below)
:	Checksum

Value	Description	Comments	Corrective User Action
0x01	Reserved
0x02	Configuration Non-dormant	Reserved	Contact Excel Tech Support
0x03	Reserved	Reserved	Contact Excel Tech Support
0x04	Disabled While Non-dormant	Reserved	Contact Excel Tech Support
0x05	Internal Outseize ACK Timeout	Channel B did not respond to connect request from Channel A within 30 seconds.	None—the Excel platform has no control over the remote channel.
0x06	Internal Disconnect ACK Timeout	Channel B did not respond to a disconnect request from Channel A within 6 seconds.	None—the Excel platform has no control over the remote channel.
0x07	Internal Connect ACK Timeout	Reserved	Contact Excel Tech Support
0x0A	Invalid RCM Stack	The RCM stack is either full or in an incorrect state.	Contact Excel Tech Support
0x0B	FEM Outseize ACK Timeout	Layer 4 did not receive an Outseize Control ACK from Layer 3 within 29 seconds.	If using PPL for L3, make sure the Outseize Control ACK is sent from Layer 3 to Layer 4; otherwise, contact Excel Technical Support.
0x0C	Internal Inconsistency	The RCM stack is in a state inappropriate for the action being processed.	Contact Excel Tech Support
0x0D	L3 Clear ACK Timeout	Layer 3 did not respond to a clear request within 150 seconds.	If using PPL for L3, make sure that a Clear ACK is sent from L3 to L4; otherwise, contact Excel Technical Support.
0x0E	L4 Hold ACK Wait Timeout	Reserved	Contact Excel Technical Support.
0x0F	L3 Answer Wait Timeout	Layer 4 timed-out waiting for a L3 answer event. Default timer: 10 minutes	If using PPL for L3, make sure a CONNECT is sent from L3 to L4. Otherwise, contact Excel Technical Support.
0x10	L4 Answer Wait Timeout	Layer 4 timed-out while waiting for the other party involved in the connection to propagate an answer. Default timer: 10 minutes	Verify answer supervision mode.
0x11	L4 Recall Wait Timeout	Timed-out while trying to recall the remote RCM.	Contact Excel Tech Support
0x12	L3 Channel Out-of-Service	Channel A did not respond to a Channel Release Request from Channel B. L4 purges in order to bring the purging timeslot into a known state.	None, the Excel platform has no control over the remote channel.
0x13	Implicated by L3	Reserved.	Contact Excel Tech Support
0x14	Implicated by L4	One of the terminating channels has detected an internal error and has been disabled. It also had its status changed to dead and has been reconfigured to some non-idle state or has been implicated in another purge.	Contact Excel Tech Support.
0x15	Implicated by LCM	One of the terminating channels has detected an internal error and has been disabled. It also had its status changed to dead and has been reconfigured to some non-idle state, or has been implicated in another purge.	Contact Excel Tech Support
0x16	Unknown LSM State	Reserved.	Contact Excel Tech Support
0x17	L3 Pre-Answer Disconnect Request	Reserved.	Contact Excel Tech Support
0x18	L3 Not Idle at Switchover	Layer 4 is idle and Layer 3 is not idle at switchover. This brings the channel into a known state.	Make sure Layer 3 is idle before issuing a switchover.
0x19	Outpulsed Digits Timeout	L4 went out of service.	Contact Excel Tech Support
0x1A	Channel bearer service modification request failed.	Two possible reasons: The VDAC-ONE card/IP Network Interface Card is not responding to the modification request. The network is not responding to the modification request.	Check if the end-point signaling with the Excel platform properly acknowledged the modification request. (For example, a RE-INVITE in SIP networks.) Contact Excel Tech Support
0x1B	Channel bearer service modification request timed out.	Layer 4 did not receive any response to modify channel bearer service request from Layer 3 within the allowed time.	Check if the end-point signaling with the Excel platform properly acknowledged the modification request ((For example, a RE-INVITE in SIP networks.) Contact Excel Tech Support
0x1C	Request to retrieve a physical span/channel resource denied by the internal router.	The virtual span/channel’s request to retrieve a physical span/channel denied by the internal router.	Check if the resource table configuration with internal router is proper. Contact Excel Tech Support
01D	Request to retrieve a physical span/channel resource timed out.	Virtual span/channel’s request to retrieve a physical span/channel timed out. No response from the internal router within the allowed time.	Contact Excel Tech Support
0x1E	Idle Purge	L4 went out of service.	Contact Excel Tech Support
0x1F	BCC Wait Timeout	A create broadcast message was sent to from L4 to BCC trying to create a conference and a timeout occurred waiting for an acknowledgment. Default timer: 6 seconds	Send a Release With Data message from the host; otherwise, contact Excel Technical Support.
0x20	L5 Release Data Wait Timeout	An ISDN Channel Release Request message was sent to the host and a timeout occurred while waiting for a Release With Data message. Default timer: 20 seconds	Send a Release With Data message from the host within 20 seconds.
0x21	L3 Remotely Blocked	Layer 4 (L4) purges because it is in a state not ready to receive an Out-of-Service blocked event from the associated Layer 3 channel. This results in bringing the channel into a known state.	None—the Excel platform has no control over the remote channel.
0x22	DSP Resource Wait Timeout	Layer 4 purges because a timeout occurred while waiting for DSP resources.	Make sure DSP resources are available.
0x23	Outpulsing Digits Timeout	Layer 4 purges because a timeout occurred while waiting for the completion of outpulsing digits.	Make sure outpulsing digits are available.
0x24	Ring Inaccessible	The node cannot access the EXNET ring due to a local EXNET hardware problem.	Rectify the hardware problem.
0x25	Node Inaccessible	The remote node cannot be accessed on the EXNET ring due to an EXNET hardware problem on the remote node.	Rectify the hardware problem.
0x26	MCC Response Timeout	Channel purges because timer expires before MCC sends Layer 4 a response to the Connect to Conference or Connect One-Way to Conference message. Default timer: 12 seconds	Contact Excel Tech Support
0x27	Internal router look up failure	Internal routing look up for a physical resource negatively acknowledged. Possibly due to lack of free physical resources. That is, demand for physical resources has exceeded the supply.	Check for consistency between actual physical resources and the internal router database configuration. If no such inconsistency is found, add more physical resources.
0x28	Internal router look up timed out	Internal routing look up for a physical resource timed out.	Contact Excel Tech Support
0x38	Remote Conferencing Timeout
0x71	Implicated in Error Detection	Reserved	Contact Excel Tech Support
0x72	Configured, Non-Dormant	Reserved	Contact Excel Tech Support
0x73	Span Receiving CGA Alarm	Channel purged because span received Carrier Group Alarm (CGA).	None—the Excel platform has no control over the remote channel.
0x74	Disabled While Non-dormant	Layer 3 purges because it is in a state not ready to bring a channel out-of-service.	Do not take a channel out-of-service when it is involved in a connection.
0x74	Disabled While Non-dormant	Sent to host whenever an E1 PPL channel is taken out-of-service with the Service State Configure message.	No corrective action is necessary.
0x75	Internal Outseize ACK Timeout	Layer 3 purges because it did not receive a wink when attempting to busy out a channel.	Verify outgoing start dial type.
0x76	Internal Disconnect Clear Wait Timeout	Layer 3 purges because a timeout occurred while waiting for Layer 4 to be cleared of a call.	Contact Excel Tech Support
0x77	Internal Connect Wait Timeout	Layer 3 purges because a timeout occurred while waiting for the channel to be connected.	None—the Excel platform has no control over the remote channel.
0x78	Busy Out ACK Timeout	Layer 3 purges because a time-out occurred while waiting for a busy out acknowledgment from Layer 4.	Contact Excel Tech Support
0x79	Internal Inconsistency	Layer 3 purges with an unexpected internal error.	Contact Excel Tech Support
0x7A	Layer 4-implicated Layer 3 Purge	Layer 4 purge implication message based upon the current condition of the call stack as well as the associated Layer 3 timeslot.	Contact Excel Tech Support
0x7B	CFG-implicated Layer 3 Purge	A channel configuration has purged to allow a new configuration to be assigned.	None—this is not an error.
0x7D	Null Outseize Control Instruction Encountered	A null outseize instruction was encountered.	Modify Outseize Control message.
0x7E	Null Outseize Instruction List Instruction Encountered	A null outseize instruction list instruction was encountered.	Modify outseize instruction list.
0x7F	Invalid Outseize Instruction Encountered	An invalid outseize instruction was encountered.	Modify Outseize Control message or programmed outseize instruction list.
0x80	Invalid Outseize Instruction Data	An invalid wink number has been specified in either: – A Scan for Wink N ICB in an Outseize Control message. – A preprogrammed Scan For Wink N outseize instruction.	Modify ICB in Outseize Control message or instruction data byte 1 in the preprogrammed outseize instruction list. The wink number must be from 1 to 8.
0x81	No Outseize Data Available	An Outpulse Stage N Address Data instruction has been included in either an Outseize Control message or preprogrammed outseize instructions without corresponding Stage N Address Data.	Include a Stage N Address Data ICB in the Outseize Control message or instruction data in the programmed instructions.
0x82	No Outseize ACK Outstanding	A Send Host ACK instruction was included in either an Outseize Control message or a programmed outseize instruction list and there are no outstanding outseize instructions.	Make sure there is only one Send Host ACK instruction per Outseize Control or outseize instruction list.
0x83	Unexpected Off-hook Detected	Layer 3 is in a "Wait For Host State" where answer is not allowed.	Modify the Outseize Control message or programmed outseize instruction list to use a Wait for Host Control with Answer Supervision ICB instead of a Wait For Host Control ICB.
0x84	On-hook Host Control Wait Timeout	Layer 3 purged waiting for host control within 120 seconds.	Provide host control within 120 seconds.
0x85	On-hook Host Data Wait Timeout	An Outpulse Stage N Address Data instruction has been included in either an Outseize Control message or preprogrammed outseize instructions without corresponding Stage N Address Data within the timer period.	Include a Stage N Address Data ICB in the Outseize Control message or instruction data in the programmed instructions.
0x86	Failure to Receive Wink	Layer 3 purges while waiting for wink from the distant end within the timer period.	None—the Excel platform has no control over the remote channel.
0x87	Wink Tolerance Exceeded	Layer 3 received a wink that exceeded the maximum allowed wink duration. If this condition happens for the initial wink, glare is declared.	If the maximum allowed wink duration is too short, increase it; otherwise, you cannot take action because the Excel platform does not have control over the remote channel.
0x88	On-hook Outpulse Complete Timeout	Layer 3 failed to get an outpulsing complete message from tone call within the Outpulse Complete Timer. Default timer: 6 seconds.	Modify the Outseize Control message or programmed outseize instructions so that the correct number of digits is being outpulsed, or increase the outpulse complete time.
0x89	Failure to Detect Off-hook	Reserved.	Contact Excel Tech Support
0x8A	Failure to Receive Call Progress Analysis Result	Layer 3 failed to get a call progress analysis result within the timer period. Default timer: 120 seconds.	Contact Excel Tech Support
0x8B	Failure to Detect Dialtone	Layer 3 failed to get dialtone detection from call progress analysis within the timer period. Default timer: 120 seconds.	Verify outgoing start dial type.
0x8C	Off-hook Host Control Wait Timeout	Layer 3 purges when a timer expires in the off-hook host control wait state. The host failed to provide further action within the timer period. Default timer: 120 seconds.	Provide host control within timer period.
0x8D	Off-hook Host Data Wait Timeout	An Outpulse Stage N Address Data instruction has been included in either an Outseize Control message or preprogrammed outseize instructions without corresponding Stage N Address Data within the timer period. Default timer: 120 seconds	Include a Stage N Address Data ICB in the Outseize Control message or instruction data in the programmed instructions.
0x8E	Invalid Off-hook Outseize Instruction	Layer 3 purged attempting to Scan For Wink or Scan For ANI Off-hook because the distant end was already off-hook.	Verify the call flow.
0x8F	Off-hook Outpulse Complete Timeout	Layer 3 failed to get an outpulsing complete message from tone control within the timer period. Default timer: 6 seconds.	Modify the Outseize Control message or programmed outseize instructions so that the correct number of digits is being outpulsed, or increase the outpulse complete time.
0x90	Invalid Inseize Instruction Encountered	An invalid inseize instruction was encountered while processing an Inseize Control message or programmed inseize instructions.	Modify the Inseize Control message or programmed inseize instruction list.
0x91	Null Inseize Instruction Encountered	A null inseize instruction was encountered while processing an Inseize Control message.	Modify the Inseize Control message.
0x92	Null Inseize Instruction List Encountered	A Null inseize instruction was encountered while processing an inseize instruction list.	Modify the inseize instruction list with the Inseize Instruction List Configure message.
0x93	Initialized Inpulsing Stage Data	A Receive Stage N Address Data instruction was included in either an Inseize Control message or programmed inseize instruction list with inpulsing parameters for stage not configured.	Modify the Inseize Control message or inseize control list so that the correct stage number is specified; or configure the inpulsing parameters with the Inpulsing Parameters Configure message.
0x94	Invalid Inseize Start Dial Signal	Reserved.	Contact Excel Tech Support
0x95	Invalid Inseize Receive Stage Condition	Reserved.	Contact Excel Tech Support
0x96	Invalid Inseize Receive Stage Parameters	A Receive Stage N Address Data instruction was included in either an Inseize Control message or programmed inseize instruction list with inpulsing parameters for stage not configured.	Modify the Inseize Control message or inseize control list so that the correct stage number is specified; or configure the inpulsing parameters with the Inpulsing Parameters Configure message.
0x97	No Receiver Request Response	A Receive Stage N Address Data instruction was included in either an Inseize Control message or programmed inseize instruction list and Layer 3 has failed to get a response from a digit receiver within the timer period.	Verify digit receiver resources.
0x98	No Digits Response	Layer 3 sent a request for digit collection, but failed to get a response within the timer period.	Make sure digit collection timers are set correctly (Inpulsing Parameters Configure message).
0x99	Inseize Host Control Wait Timeout	Layer 3 purges when a timer expires in the Inseize Host Control Wait state. The host failed to provide further action within the specified amount of time. Default timer: 120 seconds.	Provide host control.
0x9A	No Inseize ACK Outstanding	A Send Host ACK instruction has been included in either an Inseize Control message or programmed inseize instruction list but there are no unacknowledged inseize instructions.	Make sure there is only one Send Host ACK instruction per Outseize Control or outseize instruction list.
0x9B	Function Type Not Supported	Layer 3 requested DSP service but the function type requested is not available.	Make sure a DSP is configured for the function type.
0x9C	Suspend Reject	Reserved.	Contact Excel Tech Support
0x9D	Resume Reject	Reserved.	Contact Excel Tech Support
0x9E	PPL Invoked For Invalid Trunk Type	Reserved.	Contact Excel Tech Support
0x9F	PPL Null State/Event List	State/Event list is null.	Check PPL and state/event table list.
0xA0	PPL Invalid Event for Decision State	PPL is in an internal state, waiting for some event to drive it out to a normal state. It receives an internal event while in the internal state.	Check the PPL.
0xA1	PPL Timer Expired in Internal State	Reserved.	Contact Excel Tech Support
0xA2	PPL Negative Internal State Response	A negative response was received in an internal state. Layer 3 was requesting a DSP service while the service was not available or supported.	Make sure the MFDSP is configured for the function type.
0xA3	PPL Not Internal Wait Event	Reserved.	Contact Excel Tech Support
0xA4	PPL Exceeded Maximum Number of Iterations	The maximum number of PPL iterations was exceeded.	Contact Excel Tech Support
0xA5	ISDN Host Call Proceeding Wait Timeout	A time-out occurred while in the ins_pass through state.	Contact Excel Tech Support
0xA6	PPL Null Primitive	A null primitive was encountered. There is no atomic function between two states.	Check the PPL. Make sure there are atomic functions between two states.
0xAC	Invalid ISUP Data	An API message such as Release with Data (0x0036) contains invalid ICB data.	Correct the data in the ICB.
0xAF	Config Byte Max Offset Exceeded	The config byte’s max offset has been exceeded.	Contact Excel Tech Support
0xB1	Timeout Waiting for Silence in Backward Reception Mode	Reserved.	Contact Excel Tech Support
0xB2	Timeout Waiting to Receive a Forward Tone to Transmit from PPL in Backward Reception Mode	Reserved.	Contact Excel Tech Support
0xB3	Timeout While Waiting to Receive a Tone in Backward Reception Mode	Reserved.	Contact Excel Tech Support
0xB4	Timeout While Waiting for Silence in Forward Reception Mode	Timeout occurred while waiting for the incoming forward tone to terminate after a backward signal has been sent in the forward reception state machine. Default timer: 10 seconds (R2 timer #4 divided by 2)	Determine cause of sustained signal on external termination device.
0xB5	Timeout Waiting to Receive a Forward Tone in Forward Reception Mode	The termination device that initiated the call has failed to transmit a forward tone within the time allowed after transition to the wait for forward tone within the time allowed after a transitioning to the wait for forward tone state in the forward state machine. Default timer: 10 seconds (R2 timer #4 divided by 2)	Determine cause of signal delay on external termination device.
0xB6	Timeout Waiting to Receive a Backward Tone to Transmit from PPL in Forward Reception Mode	The PPL has failed to transmit a backward signal within the timer period after transitioning to the Wait For Backward Signal To Transmit state in the forward reception state machine. Default timer: 10 seconds (R2 timer #4 divided by 2)	Determine cause of failure of PPL to transmit backward signal.
0xB7	Received Silence While Waiting for an Event to Transmit a Backward Tone in Backward Reception Mode	Indicates that the termination device that initiated the call has dropped the forward signal prior to receiving a backward acknowledgment.	Determine the cause of signal drop on external termination device.
0xB8	Received an Incoming Forward Tone While Waiting to Transmit a Backward Tone in Forward Reception Mode.	Indicates a violation of compelled signaling on an incoming call. The termination device is transmitting a forward signal prior to receiving a backward acknowledgment.	Determine the cause of failure of external termination device to wait for backward acknowledgment signal.
0xCB	VDAC purges the channel because Layer 4 did not release it.	VPPL L3 on the VDAC negatively acknowledges the Outseize Control message and times out waiting for Layer 4 to release the channel. Since Layer 4 did not release the channel, VDAC purges the channel.
0xCC	Layer 3 PPL Purge Error	Varies by PPL protocol.
0xCD	Wait for Host Control Timeout	Varies by PPL protocol.
0xD4	Layer 4 Connect wait timeout	Varies by PPL protocol.
0xD5	Layer 4 Clear wait timeout	Varies by PPL protocol.
0xDA	Layer 4 Busy out ACK wait timeout	Varies by PPL protocol.
0xDD	SIP Internal Error	Could be caused by any of the following: Message size exceeds the maximum IMSG size . NPDI data size exceeds the maximum. Outgoing SIP message size exceeds 1500 Bytes.	Check the incoming SIP message.
0xDE	VDAC rejected/timeout	The message sent to the VDAC-ONE card was not acknowledged or timed out.	Check the VDAC-ONE card and router configurations.
0xDF	Network error/timeout SIP Socket Open Failure	The remote SIP entity is not responding to messages. The peer entity cannot accept any additional TCP socket connections.	Check if the remote side is down. Check the network.
0xF7	Layer 4 Clear Request timeout
0xFD	Call Progress Analysis timeout
0xFF	R2 Cycle Complete timeout
0xE0	Layer 4 response timeout	SIP timed out waiting for a response from Layer 4.
0xE1	Invalid SDP/NPDI data	In call agent mode, the user puts invalid data (typically sdp) in the Connect With Data message
0xE2	Invalid coupled channel state	The physical span/channel identifier provided by the host application (typically for call gent mode coupling) is in non-idle state in the Excel platform.	Resolve glare issues between the Excel platform and the host channel hunting and allocation algorithms.