Problem

While using a Cisco/Linksys SPA 122 adapter with an analog phone, calls drop when flashing over to the second line or when trying to transfer a call.

Cause

The hook flash timer needs to be properly set.

Resolution

Note: The first step is to capture the SPA 122's IP address so you can access its web interface (GUI). You should prepare note-taking materials.

  1. From the analog phone connected to the SPA 122 ATA adapter, dial * * * *.
  2. Press 1 1 0 # to get the device’s IP address (write it down as it is being spoken).
  3. In Account Manger, retrieve the MAC Password:
    1. Click Phone System > View All Extensions > Download Extensions (csv).
    2. In the resulting CSV, the MAC password is visible for the extension under column U: MAC Password.
  4. From a computer on the same network, type the SPA 122 IP address into a web browser and log into the device web GUI:
    • Username: admin
    • Password: [ MAC password from above ]
  5. Click Voice > Regional.
  6. Under Control Timer Values, set the following values:
    • Hook Flash Timer Min:  0.02
    • Hook Flash Timer Max: 0.9
  7. Click Submit and wait for the device's configuration menu to come back.

If the issue ever occurs again, repeating this procedure should correct it.