Channel Group

The channel group object defines incoming and outgoing attributes for a group of channels. The Channel Group object allows the user to specify a set of attributes such as IP Profiles, routing tables, translation tables, etc to be assigned to the specific channel group being configured. See Field Descriptions section below for a list of attributes that can be assigned to the channel group being configured.

Note: Many of the parameters that are configured in the channel group object are defined as routing-related or profile related. Any routing tables, translation tables, treatment tables, or ip profiles must be configured/defined before they can be assigned to a channel group.

Depending on the protocol, the 2020 IMG communicates with other entities in the network through the use of TDM channels/DS0's or IP Ports. A collection of TDM Channels or collection of IP Ports are labeled as a Channel Group. A channel group is created using a specific protocol such as SIP or SS7 and is used to group a collection of DS0's or Ports to communicate with a far end entity. On the 2020 IMG the manner in which TDM Channels and IP Ports are allocated for channel groups is distributed differently as described below.

 

TDM

A TDM channel group connects a group of DS0's together by allocating a specific number of spans/interfaces and channels into a group of channels.

ISDN

When configuring an ISDN channel group, a group of ISDN Circuits or B Channels are allocated by defining a starting and ending interface offset and starting/ending channel. The B-Channels are all configured under an ISDN Group which is communicating with a specific D-Channel selected within the ISDN Group Object.

SS7

When configuring an SS7 channel group, a group of SS7 Circuits or CIC's are allocated by defining a starting and ending interface offset and starting/ending channel. These CIC's are all configured under an ISUP Group which is communicating with a specific stack selected within the ISUP Group object.

 

VoIP

SIP

A VoIP channel group uses a revolving pool of all available IP Ports on the 2020 IMG. Within a SIP channel group, specific ports are not allocated to a specific channel group. The channel group is linked to an External SIP Gateway. The Channel group being configured would pull the IP Resources as needed. To limit the number of simultaneous calls to a SIP channel group see IP Traffic Management link.

H.323

A VoIP channel group uses a revolving pool of available IP Ports on the 2020 IMG. Within an H.323 channel group, specific ports are not allocated to a specific channel group. The channel group is linked to an External H.323 Gateway or Gatekeeper. The Channel group being configured would pull the IP Resources as needed. This is true for both calls made from gateway to gateway and calls made through use of a gatekeeper.

 

 

ClientView Pane

IMG EMS > Routing Configuration > Channel Groups > Channel Group

SC_ChannelGroup.png

 

Maximum Objects

672 Channel Groups can be created per Routing Configuration. The channel groups created can be any combination of SS7, ISDN, and SIP.

 

Related Topics and Dependencies

Configuring SIP

Configuring SS7

Configuring ISDN

Configure H.323

Configure H.323 with Gatekeeper

 

Field Descriptions

Name

Enter a name that identifies the Channel Group being configured.

 

ID

The ID field is automatically populated with the next available ID. The ID can be changed by selecting from a range of ID's from the drop down menu. The 2020 IMG supports the following range of ID's: (0 - 671)

 

Channel Group Function

This field identifies the direction of calls on this Channel Group.

Incoming/Outgoing Trunks (Default) - Channel group will be used for both incoming and outgoing traffic. (Two way traffic)

Incoming Trunks - Channel group will be used for incoming traffic only. (One way traffic)

Outgoing Trunks - Channel group will be used for outgoing traffic only. (One way traffic)

 

Signaling Type

The Channel Group being created can be configured to any one of the following signaling protocols. The protocol selected will dictate which fields can be modified. Any fields that cannot be modified for that particular protocol will be shaded in green and cannot be modified. The supported protocols which are in a drop down menu in this field are displayed below:

Incoming Translation Table

The Incoming Translation Table field identifies any Incoming translation tables that the 2020 IMG will use when performing digit translation or error detection on any incoming calls received on this Channel Group. Select from drop down menu the translation table to be used for any calls received on this Channel Group. For the translation table to appear in the drop down menu, an incoming translation table must be first be configured. See Incoming Translation Table link. If multiple incoming translation tables are configured then there will be multiple incoming translation tables to select from in drop down menu.

 

Route Table

The Route Table field allows user to select which route table out of all route tables configured to be used for routing calls received on a specific channel group. Select from drop down menu the route table to be used for any calls coming in to this channel group.

 

Incoming Treatment

The Incoming Treatment field lets the user decide what to do when a call comes into the 2020 IMG and fails to connect.

Release w/Cause (Default) - Release with cause is the default selection. If the call fails, the channel will release and transmit a cause code. Where the cause code is sent is dependent on the reason the call was released and whether the outgoing leg has started call setup on outgoing leg. The cause code value is dependent on the reason the call failed and eventually released.

Play Treatment - Play treatment is normally utilized for error detection or maintenance. When the Play Treatment option is selected, the 2020 IMG will play a pre-determined treatment file back to entity initiating the call. The treatment can indicate the channel is in maintenance, out of service, or use one of many reasons a treatment would want to be played on this channel.

 

Cause Code Mapping Table

The Cause Code Mapping Table field is used to modify an incoming cause code. The default is when a cause code is received, it is transmitted without being modified. Also, when the 2020 IMG receives a cause code, the cause code can be modified. Through the use of the Cause Code Table and Cause Code Entry objects, the cause code received can be matched and then modified. After the cause code is modified it is transmitted to the outgoing channel group with the modified cause code. Select from drop down menu the cause code table that will be used to modify the cause code. A cause code table and cause code entry must first be created. Once they are created then the cause code tables will be displayed in drop down menu.

None (Default) - If cause code mapping is NOT going to be used, leave this field at as None.

 

Incoming IP Profile

The Incoming IP Profile field allows user to select the IP characteristics for incoming VoIP calls on this Channel Group. Parameters such as voice encoding compression, payload size, echo suppression, can be configured. A drop down menu including all IP Bearer profiles configured can be used to select a specific profile. An IP Bearer Profile must first be created. Once created it will appear in this drop down menu. This field applies to SIP Channel Groups only. If configuring SS7 or ISDN then this field will be shaded green.

 

Outgoing Translation Table

The Outgoing Translation Table field identifies any Outgoing translation tables that the 2020 IMG will use when performing digit translation or error detection on any outgoing calls being transmitted on this outgoing channel group. Select from drop down menu the outgoing translation table to be used for any outgoing calls being processed through this Channel Group. For the translation table to appear in the drop down menu, an outgoing translation table must first be configured. Refer to Translation Table and Translation Entry - Outgoing for configuration information. If multiple outgoing translation tables are configured then there will be multiple translation tables to select from in drop down menu.

 

Hunting Options

The Hunting Options field specifies the hunting algorithm used for selecting a channel to route to an outgoing call.

Alternate Even / Alternate Even - For alternate odd or alternate even, the 2020 IMG will choose the TDM resource based on its channel number. (i.e position in span starting at channel 0 as even)

LRU (Least Recently Used) - Selects the channel that has been used the least.

Most Idle - Selects the channel that has been idle the longest.

Round Robin Clockwise - Starts at the first channel in the channel group and routes down the list of available channels, and then repeats from the beginning of the list.

Round Robin Counter Clockwise - Same as Round Robin Clockwise, but it starts at the last channel in the channel group and routes up the channels.

Sequential Bottom Up - Starts at the last channel in the channel group and routes up. If a prior channel becomes available this channel is used before selecting the next channel from the end of the list.

Sequential Top Down - Starts at the first channel in the channel group and routes down. If a prior channel becomes available this channel is used before selecting the next channel from the end of the list.

 

Outgoing Treatment

Allows user to decide what to do when a call fails and is released.

Release w/Cause (Default) - Release with cause is the default selection. If the outgoing call fails, the channel will release and transmit a cause code to either the calling party, the called party or both. Where the cause code is sent is dependent on the reason the call was released and whether call setup has been initiated on outgoing leg. The cause code value is dependent on the reason the call failed and eventually released.

Play Treatment - Play treatment is normally utilized for error detection or maintenance. When the Play Treatment option is selected, the 2020 IMG will play a pre-determined treatment file back to entity initiating the call. The treatment can indicate the channel is in maintenance, out of service, or use one of many reasons a treatment would want to be played on this channel.

 

Ingress Side will Play Call Progress Tones

Select whether the 2020 IMG will play a call progress tone to an inbound call. This field is applied to the outgoing channel group only.

False (Default) - When Alerting is received on the outbound channel the 2020 IMG will not generate Ring-Back tone to the inbound caller.

Note: The table below displays different scenarios of when 2020 IMG will or will not play ring back when false (default) is selected.

If the 2020 IMG receives...

Then the 2020 IMG..

180 Ringing without SDP

Will play local ring-back irrespective of configuration.

180 Ringing with SDP

Will NOT play local ring-back irrespective of configuration.

183 Progress with or without SDP

Will NOT play local ring-back irrespective of configuration.

True - When field is set to True and Alerting is received on the outbound channel the 2020 IMG will generate Ring-Back to the inbound call. Setting this field to true will also override the default mapping of the 18x alerting message (With or without SDP present). The 2020 IMG has additional rules regarding ring back when Progress indicators No. 1 and No. 8. are present. For information on this additional functionality, see Suppress Local CPT when CPG Indicators received link.

 

Outgoing IP Profile

The Outgoing IP Profile field allows user to select the IP characteristics for outgoing VoIP calls on this Channel Group. Parameters such as voice encoding compression, payload size, echo suppression, can be configured. A drop down menu including all IP Bearer Profiles configured can be used to select a specific profile. An IP Bearer Profile must first be created. Once created it will appear in this drop down menu. This field applies to SIP Channel Groups only. If configuring SS7 or ISDN then this field will be shaded in green and cannot be modified.

 

Treatment Table

If Play Treatment is selected in either the Incoming or Outgoing Treatment fields above then the treatment selected in this field will be the treatment played if a call fails on either the incoming or outgoing channel groups. The NFS server must first be configured. Refer to  Configure NFS share. The Treatment Table field will be populated with all available Treatment Tables configured. The Default Treatment Table is configured with ID:1. If custom Treatment Tables are added they will begin with ID:2

TreatmentTable ID: 1: Default

TreatmentTable ID: 2: User Created

 

Reattempt Cause Code

By default, the 2020 IMG will automatically attempt to re-route calls in response to the following cause codes: 42,41, and 34. Calls can be rerouted on up to (4) additional cause codes. This is accomplished by clicking in the Reattempt Cause Code field which is located in the Channel Group Object. A Select Multiple Items box will appear with multiple Cause Codes to select from. More than one Cause Code can be chosen by selecting <CTRL> key and clicking on multiple entries. The 2020 IMG will automatically attempt to re-route calls in response to the selected cause codes.

Note: The 2020 IMG will not re-attempt if alerting is received prior to the release response.

Not Used (Default) - Feature Disabled. 2020 IMG will only re-route on cause codes 42,41, and 34

 

Overlap Signaling

The fields Overlap Enable, Termination Digit, Minimum # of Digits, Inter SAM Timeout and Overlap Timeout all relate to Overlap Signaling only. See Overlap Signaling - Sending and Overlap Signaling Receiving for more information.

Overlap Enable (Receiving) ISDN, SS7, and SIP

Disabled (default): By default, the 2020 IMG passes only enbloc received digits to the outbound side.

Enabled: Enable overlap signaling on inbound Channel Groups when the outbound channel group does not support Overlap Signaling (SIP). The 2020 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.

 

Overlap Enable (Sending) SIP to SS7 only

Enabled: By enabling Overlap, this will allow Overlap Sending of destination address digits. In this case each received IAM and subsequent SAM messages will be interworked to a  series of INVITES each containing all the destination address digits received to that point, similarly when the SIP interface receives a series of INVITES, each containing more destination address digits than the previous one, these will be mapped into an IAM, SAM sequence with each message containing only the 'new' digits from the latest INVITE.

Note: If overlap signaling is enabled, the 2020 IMG will collect digits until one of the next four termination conditions displayed below is met.

 

Termination Digits

When Overlap signaling is enabled, the 2020 IMG will collect digits until one of the termination digits selected in drop down menu is met. The termination digits are displayed below. The default termination digit is the pound sign (#) character. When H.323 is selected as the Signaling Type, the Termination Digits field is shaded green and cannot be modified.

Note: Termination digits are not used in ISDN.

Termination Digit
# (Default)
*
0
1
2
3
4
5
6
7
8
9

 

Minimum # of Digits

When Overlap signaling is enabled, the 2020 IMG will collect digits on incoming channel group until the minimum number of digits selected is met. Once the minimum number is met, the 2020 IMG will attempt an outseize on the outgoing side. Range = 1-24 (default = 24). When H.323 is selected as the Signaling Type, the Minimum # Digits field is shaded green and cannot be modified.

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 (Subsequent Address Method) Timeout (ITU only)

The SAM is used to send Subsequent Address Signals (digits) when overlap is being used for call setup. The Inter SAM Timeout is the amount of time to wait between receiving digits. The default is 1500 milliseconds (1.5 seconds) but can be modified by clicking in the field and entering the new value. The SAM is not used in ISDN call setup. When H.323 is selected as the Signaling Type, the Inter SAM Timeout field is shaded green and cannot be modified.

 

Total Overlap Timeout

Max time allowed in seconds for call to be setup. Total Overlap timeout is used for both Minimum # of Digits or Inter SAM timeout. The Default is 18000 milliseconds (18 seconds) but can be modified by clicking in the field and entering the new value. When H.323 is selected as the Signaling Type, the Total Overlap Timeout field is shaded green and cannot be modified.

 

Support Digit A to F (Not supported in H.323)

Select from drop down menu either False or True:

False (Default): Do not support the digits 0x0a through 0x0f for translations and routing.

True : Support the digits 0x0a through 0x0f for translations and routing.

See the Digits 0x0a to 0x0f Support link for more information.

 

Channel Transfer (ISDN Only)

Disabled (Default): When disabled is selected the Two Bearer Channel Transfer feature is disabled. If Channel Group Signaling Type is configured for a protocol other than ISDN, then this field cannot be changed.

Enabled: When the Signaling Type field in the channel group pane is set to ISDN then the Transfer Mode field in the Channel Group Pane object pane can be changed to enabled. When Transfer Mode is enabled, the ISDN channel group is configured to send facility messages to the SPCS (Stored Program Control Switch) on the PBX or TDM Switch informing the TDM Switch/PBX to connect or loop two calls together. This will allow the two calls to be off-loaded from the 2020 IMG.

 

Monitoring Fields

Field

Description

ID

ID number of the Channel group the stats are being displayed for.

Name

Name given to the channel Group that the stats are being displayed

Signaling Type

Type of signaling this channel group is using. (SIP, H.323, SS7, ISDN, CAS)

Incoming Calls

Total number of incoming calls coming into a specific channel group over a period of time set in the Stats Frequency field

Incoming Answered Calls

Total number of incoming calls answered on a specific channel group over period of time set in the Stats Frequency field

Outgoing Calls

Total number of calls going out of a specific channel group over a period of time set in the Stats Frequency field

Outgoing Answered Calls

Total number of outgoing calls answered on a specific channel group over a period of time set in the Stats Frequency field

Average Hold Time for Answered Calls

Average length of time between the moment a caller gets connected till the time the call is released

Total Channels in Channel Group

Number of channels that are configured for a specific channel group

Channels in Dialing State

Number of channels that are in a dialing state at that moment in the channel group selected.

Channels in Answered state

Number of channels that are in an answered state at that moment in the channel group selected.

Channels in Disconnecting state

Number of channels that are being disconnected at that moment in the channel group selected.

Channels in blocked state

Number of blocked channels that are in an answered state at that moment in the channel group selected.

Channels in Idle state

Number of idle channels at that moment in the channel group selected

Channels in Out of Service state

Number of channels that are Out of Service in the channel group selected

Stats Frequency - (Default: 5 min.)

Interval of time in minutes which all the stats above are taken. This interval can be changed by changing the STATS_FREQUENCY line in the Defaults file located at /opt/dialogic/BDN/img_ems.

 

 

Button Functionality