Callwell has a range of options for you, you can:
Send an autoresponder by email or text, which gives reassurance that everything is being actions, there is no additional cost for this.
It’s the enquiry is for lettings, the autoresponder can include a tenant qualification to give you more insight, there is no additional cost for this.
Set up Morning Caller for sales, so all sales enquiries that have come in out of hours would be automatically called as soon as your office opens, that means your phone will start to ring with details of the enquiry and you press 1 to be connected. There is no additional cost for this either.
Or you could do both, and it’s all included in your membership.