Preview Tool

Cisco Bug: CSCtc17478 - request ability to report connection status of analog FXO ports

Last Modified

Jan 31, 2017

Products (1)

  • Cisco IOS

Known Affected Releases


Description (partial)

There is currently no facility in IOS to test an analog FXO voice-port to 
determine if it is connected to some device capable of supplying ring voltage
and current.

This behaviour is observed on all IOS Voice Routers installed with analog FXO
voice-ports, in all releases of IOS.

In IOS 12.4(20)T and newer in the IOS 12.4T train, the facility was added on the
VG224 and IAD2430 platforms with the Analog Voice Module Vinetic 2.1 chipset to
run a quick test to determine if a phone is actually attached to the analog FXS
port or not.  Similarly it is useful to have a feature to query an analog FXO
port whether it is connected to a PBX/KeySwitch station port or to the PSTN or

The current line of analog FXO hardware (VIC2-2FXO, VIC2-4FXO, EM-HDA-6FXO,
EM-HDA-3FXS/4FXO, EM2-HDA-4FXO) all make use of the same Silicon Labs Si3050 
chipset which is capable of reporting measured line voltage and current values.
This new defect report requests this capability via an IOS voice-port test 
Bug details contain sensitive information and therefore require a account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.