"Debugging and troubleshooting", "List of MyChat Client errors", "Error #0272".
Error
Error #0272: your interlocutor has no rights for receiving calls via Asterisk
You interlocutor can't receive calls via Asterisk because he has no rights to do so.
Enable a rule for making calls via Asterisk to that rights group where a user is a member, or move his account to the rights group where this option is allowed.
"Server administration", "Rights Control", "Permission groups", "Privates", "Allow receiving calls via Asterisk integration" (rule 204).