Optionalclient_The phone number that sent the message. <a href="https://community.sinch.com/t5/Glossary/MSISDN/ta-p/7628\" target="_blank">More info
The ID of this inbound message.
Optionaloperator_The MCC/MNC of the sender's operator if known.
When the system received the message. Formatted as <a href="https://en.wikipedia.org/wiki/ISO_8601\" target="_blank">ISO-8601: YYYY-MM-DDThh:mm:ss.SSSZ.
Optionalsent_When the message left the originating device. Only available if provided by operator. Formatted as <a href="https://en.wikipedia.org/wiki/ISO_8601\" target="_blank">ISO-8601: YYYY-MM-DDThh:mm:ss.SSSZ.
The Sinch phone number or short code to which the message was sent.
Regular SMS
If this inbound message is in response to a previously sent message that contained a client reference, then this field contains that client reference. Utilizing this feature requires additional setup on your account. Contact your <a href="https://dashboard.sinch.com/settings/account-details\" target="_blank">account manager to enable this feature.