Faxes Can Be Received but Cannot Be Sent

Possible Cause

The possible causes are as follows:

• Poor bearer network performance
• Inconsistent faxing modes
• Incorrect softswitch type

Solution

1. Ping the softswitch IP address to check the delay time and packet loss.
   • If the delay time is too long and packet loss occurs, the bearer network performance is poor. Verify the network connection.
   • If the network is normal, go to Step 2.

2. Check the consistency between the faxing modes of the softswitch and IAD.

   Consult related personnel about the method for viewing the softswitch faxing mode.

   To view the IAD faxing mode, proceed as follows:

   1. Run the display protocol-mode command to view the protocol used by the IAD.
   2. If MGCP is used, run the display mgcp soft-parameter command to view the faxing mode. If the faxing mode is different from that of the softswitch, run the mgcp soft-parameter fax-mode command to change the faxing mode. If the faxing modes are the same, go to Step 3.
   3. If SIP is used, run the display sip send-capability command to view the faxing mode. If the faxing mode is different from that of the softswitch, run the sip send-capability fax pri command to change the faxing mode. If the faxing modes are the same, go to Step 3.

3. Check the softswitch manufacturer and the softswitch type of the IAD.

   The softswitch type configured on the IAD must be the same as the actual softswitch type.

   1. Run the display protocol-mode command to view the protocol used by the IAD.
   2. If MGCP is used, run the display mgcp soft-parameter command to view the softswitch type of the IAD. If the softswitch type of the IAD is different from the actual softswitch type, run the mgcp soft-parameter mgc-type command to change the softswitch type. If the softswitch types are the same, go to Step 4.
   3. If SIP is used, run the display sip soft-parameter command to view the softswitch type of the IAD. If the softswitch type of the IAD is different from the actual softswitch type, run the sip soft-parameter soft-switch-type command to change the softswitch type. If the softswitch types are the same, go to Step 4.

4. Contact your service provider for assistance.