S20 support Contacts feature

Hi, my company uses 8 PBX Yeastar S20, 1 Yeastar S100 and yeastar S300.

Thanks a lot for adding SNMP at least for Yeastar S50-S300. Could you add Contacts for Yeastar S20. We really need this feature to add the CallerID Name of our Cisco 7937g conference phones, at least with a few contacts.