Card Reading Failure for the POS Device Connected to the IAD

Possible Cause

The possible causes are as follows:

• The network quality is poor.
• A media negotiation error occurs.
• The POS device is faulty.

Solution

1. Verify that the fax is configured correctly.
   • For the session initiation protocol (SIP) service, run the display sip send-capability command to view the fax priority configuration.
   • For the media gateway control protocol (MGCP) service, run the display mgcp soft-parameter command to view the MGCP software parameters.

     TERMINAL#display mgcp soft-parameter

     MGC-TYPE REGISTER-MODE CW-TONE-MODE

     SoftX Wildcard mgc

     ========================================================

     FAX-MODE HOLD-FLAG CHARGE CONTROL

     T38v3 /*fax mode*/ Off on

     ========================================================

     DUAL-TONE-DELAY

     200 ms

   The POS or modem service can be transmitted in transfer mode as the same as the high-speed fax.

   The fax modes for the MGCP service are listed as follows:

   • 711v2: 711v2: transfer mode (transparent transmission).
   • t38v2: T.38 mode
   • t38v3: T.38 or transfer mode

2. Check the setting of the V21 timer. The V21 timer of different models can be checked as follows:
   • For the IAD208E(M) and IAD132E(T), choose Advanced Configuration > User Port Attribute, or run the display pstnport attribute command to check the setting of the V21 timer. Generally, the value is set to 10 seconds. If the IAD can detect the signals sent from the timer in 10 seconds, the fax process starts. If the IAD fails to detect signals in 10 seconds, the modem service process starts.
   • For the IAD1224, choose Advanced Configuration > Setting the Fax Parameters, or run the display dsp fax-tone command to check the setting of the V21 timer. Generally, the value is set to 500 ms. If the IAD receives signals sent from the timer within 5 seconds, the fax process starts. If the IAD fails to detect signals in 5 seconds, the modem service starts.

3. If the timing duration of the V21 timer is set incorrectly, configure the timing duration of the V21 timer of different models as follows:
   • For the IAD208E(M) and IAD132E(T), choose Advanced Configuration > User Port Attribute and adjust the V21 timer setting on the displayed page, or run the pstnport attribute set command to adjust the setting.
   • For the IAD1224, choose Advanced Configuration > Setting the Fax Parameters and adjust the V21 timer setting on the displayed page, or run the dsp fax-tone set command to check the setting.

4. Verify that bearer network quality is good. For details about the network quality, see Table 2-1.
   • If the network quality is poor, change the faxing mode. For details about the mapping between the fax/modem mode and the network quality, see Table 2-2 and Table 2-3.

   For example:

   1. For the SIP service, run the sip send-capability fax pri command to set the faxing mode to T38.

      TERMINAL(advanced-config)#sip send-capability fax pri 0 t38 redundancy 2

   If the fax codec priority fails to be configured, run the display sip send-capability command to view the configuration result and query the priority mapping the codec. Then, run the undo sip send-capability fax pri command to delete the priority and run the sip send-capability fax pri command to specify a priority for the codec.

   1. For the MGCP service, run the mgcp soft-parameter command to set the faxing mode to T38.

      TERMINAL(advanced-config)#mgcp soft-parameter fax-mode t38v2

   • If the network quality is good, go to Step 5.

5. Capture network packets. Analyze and compare valid and invalid POS signaling and media signals. Check whether there are differences between valid and invalid POS signaling and media signals.
   • If yes, verify the device such as the POS that may cause the media signal exception.

   If the POS device works properly, the card reading failure is caused by the abnormal waves of the *** NGN network.

   • If no, go to Step 6.

6. Contact your service provider for assistance.