Transcript
An Overview of ISDN on the IMG
The IMG supports Integrated Services Digital Network (ISDN) for multiple communications tasking (voice, data, compressed), 128 Kbps high-speed and highbandwidth service. ISDN, non-compressed (512 KBps compressed) also provides ondemand service, connects up to eight devices simultaneously, and can be callmanaged.
The basic configuration is 23+D (Primary Rate Interface) and 30B+D outside of North America. The IMG interfaces to various equipment types supporting the ISDN PRI protocol, including tandem (Class 4) switches and end office (Class 5) switches.
The IMG ISDN PRI implementation is based on ITU-T Q.921 and Q.931 specifications. Each implemented variant references the appropriate interface document supplied by the equipment manufacturer. The interface document is usually a variant of the ITU-T recommendations. The IMG supports up to 32 D channels. Each D channel provides the High Data Link Control (HDLC) communications over T1, E1, or DS3 on one timeslot on the span. Each D channel can control up to 19 other spans in addition to the span on which it is located.
National ISDN PRI NI 2
The IMG supports National ISDN PRI NI 2. National ISDN PRI supports Non-Facility Associated Signaling (NFAS), allowing up to 30 DS1 interfaces and the D channel backup procedure, as well as B channel availability and provisioning. Connection endpoint variants are defined for National ISDN User side and Network side.
Depending upon your provisioning requirements, you can have one D channel per span [Facility Associated Signaling (FAS)], or one D channel managing up to 20 spans [Non-Facility Associated Signaling (NFAS)]. You can control a total of 32 spans using all FAS D channels, or up to 20 spans per NFAS D channel (to a maximum of 64 spans per system). You can intermix both FAS and NFAS D channels with each supporting a different variant.
Supported Features •
32 D channels per-IMG over T1/DS3
24 D Channels over or E1 (21 bearer + 3 signaling spans)
• ITU-T Q.921, Q.931-based • Variants
T1 Network Side Variants
National-ISDN 2
ATT5ESS Q.931 PRI (Custom)
ATT 4ESS Q.931 PRI
Northern Telecom DMS-100 Q.931 PRI (Custom) Northern Telecom DMS-250 Q.931 PRI JATE
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ISDN T1 User Side Variants
National-ISDN 2
JATE
E1 Network Side Variants
Euro-ISDN
Euro-ISDN
E1 User Side Variants
• D channel backup
The IMG supports the D channel backup procedure as defined by Lucent TR 41459. This procedure provides a standby D channel when using NFAS. When an active D channel fails, or if there is a span alarm, the IMG converts to the standby D channel and maintains active calls. This is a provisioned option and is applicable only when using NFAS. D channel backup is supported on the T1 only.
• NFAS
NFAS is supported over T1 with the NI-2, 4ESS/5ESS, and DMS 100/250 variants. It is not supported over E1 with the Euro ISDN variant, or over T1 with the JATE variant.
• Incoming B channel Negotiation
Interworking with SS7 ISUP
SS7 - ISDN Interworking Brief Description
The IMG supports interworking between ISDN and SS7.
For Interworking between ITU ISUP and ISDN IMG follows Q.699 recommendation.
For Interworking between ANSI ISUP and ISDN IMG follows T1.609 recommendation
Benefits
Provides cost effective TDM to SS7 ISUP switch. Limitations Related Topics
Fallback procedures are not supported in IMG, hence any interworking related to that is also not supported. Supplementary services are not supported in the IMG
Interworking Call Flows - ISDN to SS7 ISUP.
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An Overview of ISDN Configuration Prerequisites
Creating a Facility Object
Summary of Steps
The following is a summary of the basic ISDN configuration. 1. Configure ISDN Signaling 2. Configure ISDN Routing
ClientView Panes for ISDN Configuration ISDN Signaling
ISDN D Channel ISDN Group
ISDN Circuits ISDN Timers
Channel Group
The following illustration shows the objects in the Client View Configuration Tree that relate to ISDN Configuration.
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ISDN
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Configuring ISDN Signaling
Follow the procedures below to configure a D Channel on the IMG.
Configuring a D Channel
1. Right-click Signaling and select New ISDN.
2. Right-click ISDN D Channels and select New ISDN D Channel.
The ISDN D Channel pane appears. 3. Complete the fields as required. Refer to the ISDN D Channel pane reference for details.
Configuring ISDN Timers
To change the default timer values on a D Channel, perform the following: 1. Right-click the ISDN entry and select New ISDN Timers.
The ISDN Timers pane appears.
2. Change timer values as required. Next Task
Configuring ISDN Routing
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Configuring ISDN Routing Summary of Tasks
1. Create an ISDN Channel Group 2. Define an ISDN Channel Group
3. Configure Bearer Capabilities Override
4. Assign B-Channels (Circuits) to be controlled by the D Channel
Creating an ISDN Channel Group
1. Under Cantata IMG EMS, right-click Routing Configuration and select New Routing Configuration.
2. Right-click Routing Configuration and select New Channel Groups.
3. Right-click Channel Groups and select New Channel Group.
The Channel Group pane appears. 4. In the Signaling Type field select ISDN.
5. Select other fields as required. See the Channel Group pane reference for details.
Defining an ISDN Channel Group
1. Right-click the ISDN channel entry and select New ISDN Group.
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ISDN
The ISDN Group pane appears.
2. Select values as required. See the ISDN Group pane reference for details.
Configuring Bearer Capabilities Override
To set Transmission Medium Requirements (TMR) and User Service Indicator (USI) parameters:
1. Right-click the ISDN Group entry and select Bearer Capabilities Override. The Bearer Capabilities Override pane appears.
2. Make selections in each field as required. See the Bearer Capabilities Override pane for details.
Assigning B-Channels (Circuits) to be controlled by the D Channel
1. Right-click the ISDN group entry and select New ISDN Circuits.
The ISDN Circuits pane appears.
2. Fill in fields as required. See the ISDN Circuits pane GUI Reference for details.
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NFAS Examples Both these examples do not affect the already configured channels running calls. Both these scenarios show a single Channel Group called ISDN_Inbound. You could also have separate Channels Groups with the 2 scenarios mentioned with the same results.
Example 1: Multiple ISDN Circuits within the same ISDN Group
Step #1: Create 2 spans (Span 0, Span 1). The D-Channel is on span 0 and the first facility span is 1.
Step #2: Add another Facility (Span 2) to the ISDN Group.
Example 2: Multiple ISDN Groups
Step 1: Configure 2 spans (Span 0, Span 1). The D-Channel is on span 0 and the first facility span is 1.
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ISDN
Step 2: Add another Facility (span 2) to the new ISDN Group. This allows you to set attributes such as Bearer Capabilities and Network Type differently from the other ISDN Group.
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ISDN Call Flows Basic ISDN to SIP Call Flow Basic SIP to ISDN Call Flow Basic ISDN to H.323
Basic ISDN to SIP Call Flow
Basic SIP to ISDN Call Flow
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ISDN
Basic ISDN to H.323
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Channel Group Pane Description
This pane defines incoming and outgoing attributes for a channel. It identifies the tables to be used for routing and translating calls. It also identifies the IP bearer profiles for H.323 channel groups.
NOTE: Many of the parameters that you specify for a channel group are defined as routing-related tables. Therefore, you must define the applicable tables at the routing level before you can assign them to a channel group. Related Topics
Creating a Channel Group
Creating_an_H_323_Channel_Group Creating a SIP Channel Group
Creating_an_SS7_Channel_Group Creating an ISDN Channel Group Accessing this Pane
Cantata IMG EMS -> Routing Configuration -> Channel Groups-> Channel Group
Maximum Objects: 672 per EMS Technical Notes
When configuring a Channel Group, the following happens:
Incoming and attributes to be used while routing calls to/from the channel group are configured. Pane
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ISDN
Field Descriptions Name
This field identifies the name of the Channel group. ID
A unique ID for this Channel Group. Channel Group Function
This field identifies the direction of calls on this Channel Group.
Incoming/Outgoing Trunks: Two way traffic (only valid option for IP Channels)
Incoming Trunks: One way traffic, Incoming only (not valid option for IP Channels) Outgoing Trunks: One way traffic, Outgoing only (not valid option for IP Channels)
Signaling Type
The signaling to be performed on this Channel Group.
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SS7
Channel Group
H323
SIP
ISDN
Incoming Translation Table
Identifies the Incoming translation table that the IMG uses for digit translation and error detection for incoming calls received on this Channel Group. Route Table
Identifies the route table to be used for routing calls received on this Channel Group. Incoming Treatment
Indicates the way in which the IMG releases a failed incoming call.
Play Treatment
Release w/Cause
Cause Code Mapping Table
Specifies an override treatment for a cause code, enabling you to customize the cause codes with alternate treatments.
None
Incoming IP Profile
Indicates the IP characteristics for incoming Voice over IP calls on this Channel Group, including voice encoding compression, payload size, echo suppression, and other parameters. This applies to H.323 and SIP channel groups only. Outgoing Translation Table
Indicates the outgoing translation table that the IMG uses for digit translation for outgoing calls on this channel Group. Hunting Options
This field specifies the hunting algorithm used for selecting a channel to route an outgoing call.
Alternate Even
LRU (Lease Recently Used)
Alternate Odd Most Idle
Round Robin Clockwise 15
ISDN
Round Robin Counter Clockwise
Sequential Top Down
Sequential Bottom Up
Outgoing Treatment
Specifies the way in which the IMG releases a failed outgoing call.
Play Treatment
Release w/Cause
Ingress Side will Play Call Progress Tones
This field specifies if the incoming side will play call progress tones or not.
True
False
Outgoing IP Profile
Identifies the IP characteristics for outgoing Voice Over IP calls on this Channel Group, including voice encoding compression, payload size, echo suppression, and other parameters. This applies to H.323 and SIP channel groups only. Treatment Table
Identifies the treatment table that the IMG uses if a call fails and the outgoing treatment is set to Release w/cause.
TreatmentTable ID: 1: Primary
TreatmentTable ID: 2: Secondary
Reattempt Cause Code
The IMG will automatically attempt to re-route calls in response to the following cause codes: 42,41,34. Use this field to select up to 4 additional Cause Codes for which the IMG will re-attempt a new call, per trunk group. Receive Gain/Transmit Gain
Configures the Input and Output Gain on a per Channel Group basis for TDM and RTP channels. Transformations are allowed from -21 dB to +18 dB in 3 dB increments. When 0 dB is selected the transformation option is disabled Clipping - In the case of TDM to TDM calls, the combined Receive and Transmit Gain will be clipped at +18 dB. For example, if channel group A had the Receive gain set to +12 dB and channel group B had its Transmit gain set to +10 dB, and the call was flowing from A to B, one would expect +22 dB of gain. However, the IMG will
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Channel Group implement clipping, so the gain on this call would be +18 dB. It will work the same in the reverse direction as well. Gain Control is not supported for pre-call announcements, treatments, or ringback.
___________________________________________________________________ _____________________________ The following fields relate to Overlap Signaling. See Overlap Signaling for more information. Overlap Enable
Enable
Disable (default)
Enable overlap signaling on inbound Channel Groups when the outbound channel group does not support Overlap Signaling (SIP, H.323). The IMG will collect address digits until a Termination Condition is met and then continue call processing. See below for protocol-specific information. Overlap is only applied to the inbound channel, even on an Incoming/Outgoing Trunk. By default, the IMG passes digits to the outbound side as they are received.
Termination Digits
Digit to indicate end of overlap sending. Default for SS7 Channel Group = # Not used for ISDN
Minimum # of Digits
The minimum number of digits that the IMG will wait for (collect) in the incoming side before attempting an outseize on the outgoing side. 1-24 (default = 24)
NOTE: This field is different from the Max # CdPN digits (IAM) field in the ISUP Group pane, which applies to the outgoing ss7 calls. Inter SAM Timeout
Time to wait for another SAM digit before continuing with call processing. Default = 1500
Not used for ISDN Total Overlap Timeout 17
ISDN Amount of time to wait for either Minimum # of Digits or Inter SAM timeout to occur before continuing with call processing. Default = 18000
___________________________________________________________________ _____________________________ LNP Based Routing
Enable
Disable (default)
See Local Number Portability (LNP). Informational Fields
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ISDN Circuits Pane Description
Use this pane to assign B-Channels to a D-Channel. Related Topics
Assigning B-Channels (Circuits) to be controlled by the D-Channel Accessing this Pane
Cantata IMG EMS-> -> Routing Configuration -> Channel Group -> ISDN Group -> ISDN Circuits
Maximum Objects: 480 per ISDN Group Pane
Field Descriptions IMG Interface Type of Circuits
Bearer
Signaling
Start Interface Offset
Beginning span in this Circuit Group. Start Channel
Beginning channel in this Circuit Group. End Interface Offset
Last span in this Circuit Group. 19
ISDN End Channel
Last channel in this Circuit Group. Start Facility Number
The number of the first Facility in the group. Informational Fields Trunk Type
Informational Field - The trunk type of this Circuit Group. B Channel Count
Informational Field - The number of B Channels in this Circuit Group. Channel Count
Informational Field – This is the total number of channels, including D- Channels, on the span.
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ISDN D Channel Pane Description
Use this pane to configure an ISDN D Channel. Related Topics
Overview of ISDN Configuration Configuring a D-Channel Accessing this Pane
Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN -> ISDN D Channels -> New ISDN D Channel
Maximum Objects: T1 – 32/ E1 - 24 per Physical IMG Pane
Field Descriptions
Primary Interface - Offset
The span on which the primary D Channel is located. Primary Channel
The channel on which the primary D Channel is located. NFAS Supported
Indicates if NFAS is supported on the D Channel.
Yes (default) No
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ISDN
Secondary Interface - Offset
If NFAS is enabled, the span on which the secondary D Channel is located. Secondary Channel
If NFAS is enabled, the channel on which the secondary D Channel is located. Base Variant
The base ISDN variant used. The default is National-ISDN 2 Network Side. T1 Network Side Variants
National-ISDN 2
ATT 5ESS Q.931 PRI (Custom)
ATT 4ESS Q.931 PRI
Northern Telecom DMS-100 Q.931 PRI (Custom) Northern Telecom DMS-250 Q.931 PRI JATE
T1 User Side Variants
National-ISDN 2 JATE
E1 Network Side Variants
Euro-ISDN
E1 User Side Variants
Euro-ISDN
B Channel Selection
Determines the hunt method for selecting B Channels.
Linear Clockwise (default)
Circular Clockwise
Linear Counter Clockwise
Circular Counter Clockwise
HDLC Bit Polarity
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Normal (default)
ISDN D Channel
Inverted
Network Side Layer 2 Override
Options vary depending on variant.
Location
The value populated in the Location parameter in the Cause IE when a call is released.
User (0 - Message Generated by User) (default)
Local public network (2 - Message generated by public network serving the local user)
Private Network (1 - Message generated by private network serving the local user)
Transit network (3 - Message generated by transit network)
Remote public network (4 - Message generated by public network serving the remote user) Remote private network (5 - Message generated by private network serving the remote user) International network (7 - Message generated by international network)
Network Beyond Interworking Point (0A - Message generated by network beyond inter-working point)
Informational Fields
D Channel Status
In Service
Active
Out of Service Standby
Not Aligned
Secondary D Channel Status
In Service
Active
Out of Service Standby
Display Table 23
ISDN This table shows all of the D Channels configured.
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ISDN Group Pane Description
Use this pane to configure an ISDN Group. Related Topics
Defining an ISDN Channel Group Accessing this Pane
Cantata IMG EMS-> -> Routing Configuration -> Channel Group -> ISDN Group
Maximum Objects: T1 - 32/ E1 - 24 per Channel Group Pane
Field Descriptions
ISDN D channel
The D Channel that provides signaling for this group. Network Type
Do Not Include Network-Specific Facilities (NSF) IE
ATT Megacom 800 Service
ATT Software Defined Network ATT Megacom ATT Accunet
ATT Long Distance Service ATT International 800 ATT Multiquest
Northern Telecom Private Net Northern Telecom InWats
Northern Telecom OutWats
Northern Telecom Foreign Exchange 25
ISDN
Northern Telecom Tie Trunk Northern Telecom TRO Call
Bearer Capabilities Allowed
Voice (default)
Unrestricted 56K
3.1 KHz audio
Unrestricted 64K Restricted 64K 384K
7.1 KHz Audio
Discard Privacy Info
Option selected is removed from the outgoing SETUP message. See Configuring SIP Privacy.
Off (default except for ISDN B Channels)
Generic Number Only
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Display Only (default for ISDN B Channels) Display and Generic Number Calling Party Only
Display and Calling Number
Calling, Display and Generic
ISDN Signaling Pane Description
This a container object for configuring ISDN D Channels. After creating this object, right-click on ISDN D Channels and select New ISDN D Channel. Related Topics
An Introduction to ISDN
Overview of ISDN Configuration Configuring ISDN Signaling Accessing this Pane
Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN
Maximum Objects: 1 per Physical IMG
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ISDN Timers Description
Use this pane to change default ISDN Timers, if required. Related Topics
Configuring ISDN Timers Accessing this Pane
Cantata IMG EMS -> Logical IMG -> Physical IMG -> Signaling -> ISDN D Channels > ISDN D Channel -> ISDN Timers
Maximum Objects: 1 per ISDN Signaling object Pane
Field Descriptions
Q931 T303 (10 ms)
The value for ISDN Timer T303, in 10 ms increments. Q931 T305 (10 ms)
The value for ISDN Timer T305, in 10 ms increments. Q931 T308 (10 ms)
The value for ISDN Timer T308, in 10 ms increments. Q931 T310 (10 ms)
The value for ISDN Timer T310, in 10 ms increments.
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