Please provide a snippet of the part of the specification which we violate if possible: Whether or not the roster has been modified since the version ID enumerated by the client, the server MUST either return the complete roster as described under Section 2.1.4 (including a 'ver' attribute that signals the latest version) or return an empty IQ-result Please provide a link to the specification: https://www.rfc-editor.org/rfc/rfc6121#section-2.6.3 Description: mod_roster announces roster versioning, mod_groups removes the ver attribute from roster request responses.