You can reset the SPA3102 to factory default using the Interactive Voice Response (IVR) and following these steps:
- Plug a phone into the Phone 1 port
- Press “****”
- Enter “73738,” then “#”
- Press “1” to confirm
This sequence can be found in the documentation, which is available here: http://www.cisco.com/en/US/docs/voice_ip_comm/csbpvga/ata/administration/guide/ATA_AG_v3_NC-WEB.pdf.