3CX can make an api call successful to Zoho but the phone number is truncated. For example, if I search for 5551234 it's truncated to 551234.
Request text: https://www.zohoapis.com/crm/v2.1/Contacts/search?criteria=((Phone:equals:551234) or (Mobile:equals:551234) or (Home_Phone:equals:551234)...