Administering BSR polling over IP without the B-channel

Last Updated : Aug 27, 2019 |

Before you begin

  • You must administer multisite BSR. If the Communication Manager version is lower than R11, the CISC SETUP does not start vector processing and the poll operation ends in a time out, logging a vector event. Vector processing continues with the next step.

  • You must set the following fields to y:

    • IP Trunk

    • QSIG Basic Call Setup

    • QSIG Basic Supplementary Services

  • You must have the TN799 C-LAN circuit pack to support D-channel signaling.

About this task

You can configure BSR polling to prevent using a Bearer (B) channel when a polling signal is sent over an H.323 IP trunk. This feature offers the following advantages:

  • Improved trunk efficiency: BSR polling uses QSIG Call Independent Signaling Connections/Temporary Signaling Connections (CISC/TSCs) that send BSR polls over the D-channel without associated seizure of a B-channel. With this polling strategy, more trunk bandwidth is available for other forms of voice or data traffic.

  • Reduced hardware requirements: If you do not require the Voice over IP (VoIP) functionality for the trunk, an IP Media Processor (MedPro) circuit pack (TN2302) is not required.

    Note:

    BSR polling over IP without the B-channel uses non-call associated TSCs.

Procedure

  1. Set up the signaling group for H.323, QSIG, and NCA-TSCs.
  2. Set up the designated trunk group for ISDN and IP with a minimum of one assigned trunk.
    Important:

    If an IP MedPro circuit pack is not installed, the Trunk Group Status screen indicates the trunk as out-of-service. The circuit pack installation does not affect the status poll signaling over the D-channel.