4.6.2. SignalingType (Signaling Type)

Parameter Number: 0x1602

Description: The SignalingType parameter defines the signaling type to be used by the T-1 or E-1 line. Signaling types include:

• Channel associated signaling (CAS) - In CAS, the signaling for each channel is directly associated with that channel. T-1 robbed-bit signaling is an example of CAS.
• Common channel signaling (CCS) - In CCS, a common channel carries the signaling for all of the channels on that T-1 or E-1 line. ISDN is an example of CCS, where the D channel is used to carry the signaling for all of the B channels.

  When using non-facility associated signaling (NFAS) in ISDN applications, the SignalingType must be set to CCS for the primary ISDN trunk.

• Clear channel signaling (Clear) - In this type, none of the channels on the T-1 or E-1 line are used for signaling purposes.

  Clear channel signaling is the ability to access telephony channels in the system and configure them to a user defined call control protocol, or to simply leave the lines 'clear'. The resources should have access to the telephony bus for media routing purposes, as well as signal detection, signal generation, and tone generation capabilities, if desired.

When using Non-Facility-Associated Signaling (NFAS), Signaling Type is dependent on whether the T-1 or E-1 line is a primary ISDN trunk or NFAS trunk. When using NFAS, SignalingType must be set to Clear for all of the NFAS ISDN trunks. For additional parameters that need to be modified for NFAS, see Section 4.7, [NFAS] Parameters

Values:

• 4 = CAS - Defines the signaling type as channel associated signaling (CAS).
• 5 = CCS - Defines the signaling type as common channel signaling (CCS).
• 6 = Clear - Defines the signaling type as clear channel.

Click here to contact Telecom Support Resources