Thanks Alan. I had seen that thread but it did not work. I had also found some useful information in
http://www.obitalk.com/forum/index.php?topic=7608.0 but still could not find the right digit maps and star code settings.
For the moment, I have created a second user within my Anveo account and set the cid2 as the default for the second user and set this user as SP4. Now, I can use SP3 as the default for Phone1 and SP4 for Phone2 with the respective cid1 and cid2.
While it works, I am sure that this is not the most elegant solution as it uses up 2 of the 4 Obi202 provider accounts and needs an extra Anveo user account.
I am sure someone experienced with digit maps and star codes will suggest something better.