You can't (and don't need to) set a landline as SP1 or (SP2). SP1 and SP2 are only for SIP or GoogleVoice VoIP.
Have you read the Obi Device Administration Guide? On-line and pdf versions available at
http://obihai.com/docs-downloads.php.
You need to discover which of these two is the reason for no caller ID on incoming landline calls:
1. The Obi110 is not recognising/decoding the caller ID info from the landline.
2. The caller ID info sent by the Obi110 to the phone is missing, incorrect or the phone is not recognising/decoding it.
Use the 'Call History' to see if the Obi is getting caller numbers OK from the landline.
That caller ID works on incoming GV calls indicates that when the Obi110 sends caller ID to the phone it is displayed OK.