The OpenSIPS service returns the "477 Send failed" error

Last Updated : Dec 16, 2021 |

Condition

The OpenSIPS server returns the 477 Send failed error to a TFS request.

Cause

The TCP link between an endpoint and the OpenSIPS service is down.

Solution

Procedure

  1. Access the active Routing Core Server.
  2. In the OpenSIPS container, get the tcpdump traces.
  3. Using Wireshark, filter the data with the following parameter:

    tcp.flags.fin=1 || tcp.flags.reset=1

  4. In the filtered data, check if the endpoint or the OpenSIPS service closes the connection.
  5. If the endpoint closes the connection, check the endpoint configuration.

    For more information about the endpoint configuration, see the documentation of endpoints that you use in your contact center.

Related information
Accessing a contact center server from the Configuration Server using SSH