No Calling Number is Displayed on Phones

problem description

When a PSTN user makes a call to an intra-office user through the FXO port on the IAD132E(T), the calling number is not displayed to the intra-office user.

• The FSK signal is too weak to be detected by the FXO port.

Solution

1. Contact the carrier to check whether the CLIP service is enabled for the PSTN user connected to the IAD.
   • If no, contact the carrier to enable the CLIP service.
   • If yes, go to step 2

2. Replace the phone with a phone that is running properly, and check whether the fault is rectified.
   • If yes, the phone is faulty. Replace the phone.
   • If no, go to step 3.

3. Gradually lower the DSP gain.

   Run the following command and check whether the fault is rectified:

   TERMINAL(advanced-config)#DSP fsk GAIN 6

   You are advised to adjust the value from 6 bidirectionally.

   • If yes, the procedure ends.
   • If no, go to step 4.

4. Check whether the CLIP function is enabled for the FXO port on the IAD132E(T).
   • If yes, go to step 5.
   • If no, run the sip userport numberfxo-clip yes command. Fox example:

     Terminal(config)#sip user 24 fxo-clip yes

5. Capture logs about the FXO port, and check whether there are records about FSK signals or FSK detection timeout.
   • If yes, go to step 6.
   • If no, check whether the calling side sends the calling number. No calling number is displayed on phones connected to the FXS port if the number is not sent.

6. Contact your service provider for assistance.