Cisco Webex webhooks accept a filter string made of one or more field/operator/value triplets joined by “&”.

• The only operators allowed are = and !=.

• For message or membership resources the supported fields include roomId and personId.

Therefore a filter beginning with roomId=… or personId!=… is syntactically and semantically valid, while the other strings contain unsupported fields or illegal syntax.

C. spaceId=  No Webex resource recognizes a spaceId field; the API uses roomId or teamId.

D. personId=$spaceId= Contains unsupported field (spaceId) and illegal double “=”.

E. personId=$roomId= Mixes two fields in one term and repeats “=”; not valid syntax.

1. Cisco Webex for Developers

API Reference – “Create a Webhook”

parameter “filter”. States: “Filter functions are of the form fieldName=value or fieldName!=value.” (web page section “Request Body Parameters”

retrieved 2024-08-26).

2. Same page

sub-section “Supported filters by resource”. Lists roomId and personId for messages and memberships resources.