The initial members of the group. Constraints: Elements must be phone numbers in <a href="https://community.sinch.com/t5/Glossary/E-164/ta-p/7537\" target="_blank">E.164 format MSISDNs.
Optional
Name of group.
The initial members of the group. Constraints: Elements must be phone numbers in <a href="https://community.sinch.com/t5/Glossary/E-164/ta-p/7537\" target="_blank">E.164 format MSISDNs.