| 摘要 |
A first presence server as comprises a part of a first communications domain and a second presence server as comprises a part of a second communications domain are configured and arranged to communicate presence information regarding the respective client devices of their respective communications domains. Pursuant to one approach, session initiation protocol messaging facilitates such an exchange of presence information. Pursuant to one embodiment, inter-domain presence information can be cached at a receiving presence server to permit subsequent use when responding to a local request for inter-domain presence information.
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