Trunk Timeslots CCS Settings Help

The page Trunk CCS Signaling Settings allows configuring the CCS signaling settings and gives a possibility to select the timeslots for signaling data transmit/receive and voice transfer. The page consists of the following components:

• The Non Automat checkbox switches to non-automatic Terminal Endpoint Identifier (TEI) searching and enables the TEI Address text field that requires a TEI number (digit values from 0 to 63) for connection establishment between CO and E1/T1 client. In automatic mode, an E1/T1 connection will be established on the first available TEI, while in non-automatic mode a specific TEI may be reserved for the connection. In this case both call partners need to specify the same TEI in their settings.
  In the Network Mode (PBX connected):
  • If Non Automat mode is selected the same TEI address should be specified on both sides Quadro and PBX.
  • If Automat mode is selected the user on PBX side will have the opportunity to set any mode related to TEI assignment in PBX configuration. This will allow PBX connection to Quadro without providing TEI address from Quadro.
  In the User Mode (CO connected) the TEI assignment is dependent on CO settings:
  • Select Non Automat mode and insert the same TEI address provided by CO.
  • Select any mode related to TEI assignment if automat TEI searching mode is selected on CO side.
• The SAPI Value text field requires an additional Service Access Point Identifier (SAPI) value (digit values from 1 to 62) that is used to support additional interface between ISDN Layer 2 and Layer 3. Leaving this field empty (default value), only Call Control and Layer 2 management procedures will be activated.
• When Alternative Disconnection Mode checkbox is not selected, Quadro will disconnect the call as soon as disconnect message has been received from the peer, otherwise, when checkbox is selected, Quadro's user may hear a busy tone when peer has been disconnected.
• Two groups of timers need to be provided. These settings are adjusted according to the Service Provider requirements.
  ISDN L2 Timers:
  • The Excessive Ack. Delay T200 text field configures the period in milliseconds (digit values from 500 to 9999) between transmitted signaling packet and its acknowledgement received.
  • The Idle Timer T203 text field configures the period in milliseconds (digit values from 1000 to 99999) for E1/T1 client idle timeout.
  ISDN L3 Timers:
  • The T302 Timer text field requires the value for the T302 timer in milliseconds (digit values from 0 to 15000) and indicates the time frame system is waiting for digit to be dialed and when timer expires, it initiates the call. Timer is not applicable for DMS-100 switch types.
  • The T309 Timer text field requires the value for the T309 timer in milliseconds (digit values from 0 to 90000) responsible for call steadiness during link disconnection within the period equal to this timer value. If the value in this field is 0, T309 timer will be disabled.
  • The T310 Timer text field requires the value for the T310 timer in milliseconds (digit values from 1000 to 120000) responsible for the outgoing call steadiness when CALL PROCEEDING is already received from the destination but call confirmation (ALERT, CONNECT, DISC or PROGRESS) is not yet arrived.
  • The No Answer Disconnect Timer text field is only available in Network mode and requires the value for the No Answer Disconnect Timer (digit values from 0 to 200000). This timer is used in certain types of PBXs. The value 0 indicates that the timer is disabled. When time expires, Quadro will play a busy tone towards the PBX if the call has been disconnected by the peer.
Channels (Timeslots):
• The D Channel Timeslot For Transmit/Receive drop down list contains the timeslots to be selected for signaling data transmit/receive.
• The B Channel leads to the Signaling Type CCS - B Channel Settings page where available timeslots may be enabled/disabled for the voice transfer and echo cancellation feature may be configured. The Force Update option can be optionally used to apply new settings immediately. The Restart option is used to bring timeslot(s) to the initial idle state on the both sides. When applying one of these options, any active traffic on the timeslot(s) will be terminated.
  
  • Channel Selection drop down list is used to select between the Preferred and Exclusive B channel selection methods. For Preferred channel selection, the CO answers to the call request by the first available timeslot, while for Exclusive channel selection CO should feedback only by the timeslot used for the call request.
  • Channel Selection Ordering drop down list is used to adjust the B channels selection (Ascending or Descending). When Ascending selection is configured, B channels will be defined starting from B1 to B23/B30. For Descending selection, B channels will be defined from B23/30 to B1. If your CO/PBX has Ascending B channels selection configured, it is recommended to use Descending B channels selection and vice versa.
  Edit functional button opens B channels - Edit Entry page, which contains 3 checkboxes:
  • Enable Timeslot - used to enable/disable the selected timeslot(s);
  • Force Update Timeslot - used to apply new settings immediately by restarting the timeslot(s);
  • Enable Echo Cancellation - used to enable/disable the echo cancellation feature on the selected timeslot(s).
  Attention: A timeslot can be used either for voice or data transfer. Timeslot selected for the D Channel receive/transmit is missing in the list of B channels.
• The Bearer Establishment Procedure drop down list allows to select the session initiation method on the B channels. One of the following possibilities of the transmission path completion prior to receipt of a call acceptance indication can be selected:
  • on channel negotiation at the destination interface;
  • on progress indication with in-band information;
  • on call acceptance.
• The Calling Party Type of Number drop down list allows to select the type identifying the origin of call.
• The Called Party Type of Number drop down list allows to select the type identifying the subaddress of the called party of the call.
• The Called Party Numbering Plan and Calling Party Numbering Plan drop down lists indicates correspondingly the numbering plan of the called party's and calling party's number.
• The Route Incoming call to drop down list contains the Attendant, Routing agent with two kinds of call routing possibilities, and all extensions of Quadro and allows selecting the destination where the incoming calls will be routed to. Choosing the Routing with inbound destination number selection will automatically use the initially dialed number to connect the destination without any additional dialing.
  Attention: When Quadro acts in the Network mode with the Attendant as a destination to route the incoming calls to, digit forwarding should be disabled on the private PBX side otherwise incoming digits can be taken as a special calling codes on the Quadro's Attendant.
• Switch Type is another configuration parameter that depends on the CO when acting in the User mode and the private PBX capabilities when acting in the Network mode.
• The Generate Progress Tone to PSTN/PBX drop-down list contains the options for sending progress (ring-back) tone to callers from the PSTN/PBX. The following options are available in the list:
  • None configures the system to send ALERT messages without the Progress Indicator information element (IE).
  • Unconditional configures the system to send ALERT/PROGRESS messages with the Progress Indicator IE. With this option, the system will send its own progress tone.
  • Conditional configures the system to send ALERT/PROGRESS messages with Progress Indicator IE. With this option, the system will send its own progress tone only if there is no early media (180/183 with SDP) from the called party.
• Incoming Called Digits Size text field indicates the number of received digits (in a range from 0 to 255) required to establish a call. When field has 0 value, system uses either timeout defined in the T302 field or the Sending Complete Information element messages to establish a call. Independent on the value in this field, Sending Complete Information element and pound sign always cause the call establishment.

DID Service:
• Disable DID Service disables the DID Service
• Enable DID Service enables the DID Service. The CCS DID Service button leads to the CCS DID Service page where CCS DID number(s) may be configured.


• The Generate Progress tone on IP checkbox selection will generate the progress tone to IP (H.323 or SIP).
• If the Send ALERT Message on Call Ringing checkbox is selected, the system will send ALERT messages to callers from the PSTN/PBX on call ringing. If not, the system will send a PROGRESS message on receiving early media from the called party if the Generate Progress Tone to PSTN/PBX setting is not set to None.
• Enable CLIR Service checkbox selection enables Calling Line Identification Restriction (CLIR) service which displays the incoming caller ID only in case if Presentation Indication is allowed on the remote side. Otherwise, if CLIR service is disabled, caller ID will be unconditionally displayed.
• When the Enable Connect Acknowledge Option checkbox is selected, Quadro will stop the T303 and T310 timers upon receiving the CONNECT message, will send a CONNECT ACKNOWLEDGE message to the remote side and enter the active state. When this checkbox is not selected, Quadro will stop the T303 and T310 timers upon receiving the CONNECT message and will enter the active state without sending the CONNECT ACKNOWLEDGE message to the remote side.

• The Disable P-Asserted-Identity radio button disables the P-Asserted-Identity feature for both incoming and outgoing calls.
• The Override CLID with P-Asserted-Identity radio button selection enables the SIP P-Asserted-Identity support.
  For the calls from SIP to E1/T1 if the Invite SIP message contains a P-Asserted-Identity or a P-Preferred-Identity or a Remote-Party-ID, then the CallerID on E1/T1 is sent with the original Caller ID which comes from the identity field. SIP user agent should check for the existence of the P-Asserted-Identity, then the P-Preferred-Identity, then the Remote-Party-ID to fill the identity field.
  For the calls from E1/T1 to SIP with restricted Caller ID, the SIP Invite message contains P-Asserted-Identity field with the value from the Caller ID on E1/T1. The SIP From field contains anonymous.
• The Use Redirecting Number Info Element with P-Asserted-Identity radio button selection enables full support of the SIP P-Asserted-Identity.
  For the calls from SIP to E1/T1, if the SIP Invite message contains a P-Asserted-Identity or a P-Preferred-Identity or a Remote-Party-ID, then the CallerID on E1/T1 contains the number from the user name field and the Redirecting Number IE contains the original number from the identity field. SIP user agent should check for the existence of the P-Asserted-Identity, then the P-Preferred-Identity, then the Remote-Party-ID to fill the identity field.
  For the calls from E1/T1 to SIP with Caller ID, the SIP Invite message contains P-Asserted-Identity field with the original number value from the Redirecting Number IE on E1/T1. The SIP From field contains the value from the user name.