Common issues with the analog FXO and FXS circuits

[TCC_2]

Core Issue

Before addressing issues with analog Foreign Exchange Office (FXO) or Foreign Exchange Station (FXS) circuits, ensure that your configuration is correct and that your hardware supports these circuits.

For more information, refer to these Cisco TAC Case Collection cases:

• How to understand and configure analog FXO or FXS: Understanding and configuring analog FXO and FXS

Resolution

Some of the common issues observed with the analog FXO and FXS circuits are documented in these cases:

• In CallManager, the analog FXO and FXS card is not recognized by the gateway

• No dial tone received from gateway voice port after phone goes off-hook
• In CallManager the FXO card does not send or pulse out digits

For more information on no dial tone issues, refer to Troubleshooting No Dial Tone Issues.