- Servers supporting this specification MUST advertise this to clients. A client wishing to use MIX MUST check for this capability in the local server before using MIX. The capability is represented by the 'urn:xmpp:mix:pam:0' feature. + Servers supporting this specification MUST advertise this to clients for which they wish to support this specification. A client wishing to use MIX MUST check for this capability in the local server before using MIX, by verifying support for the client's account. The capability is represented by the 'urn:xmpp:mix:pam:0' feature.
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