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This behavior is expected. The valid combinations of BRI Voice Interface Cards (VICs) and voice network module hardware are:

  • VIC2-2BRI-NT/TE with NM-HD-1V, NM-HD-2V, NM-HD-2VE, and NM-HDV2
  • VIC-2BRI-NT/TE or VIC-2BRI-ST-TE with NM-2V

The only combination of hardware which is currently supported    for the Cisco CallManager Cisco Media Gateway Control Protocol (MGCP) BRI backhaul feature is VIC-2BRI-NT/TE or VIC-2BRI-ST-TE with NM-2V. Any other combination of Network Modules (NMs) and    VICs is unsupported, and does not function. The only workaround is to use the correct combination of hardware.

The MGCP backhaul feature is currently supported in Cisco IOS  Software version 12.3(2)T and later, only on the original host network modules and BRI VICs. The MGCP backhaul feature is not supported on any C5510 DSP-based BRI modules in 12.4(2T).

For details on how to upgrade to 12.4(2T), refer to Cisco IOS Software Major Release 12.4.

For additional related information, refer to MGCP-Controlled Backhaul of BRI Signaling in Conjunction with Cisco CallManager.

Problem Type

Gateway or module

Call control software  (CallManager, CallManager Express, ICS7750, SRST, SS7 call agents)

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