| 摘要 |
A Session Initiation Protocol (SIP) proxy is dedicated, at least in part, to supporting routing of communications for a plurality of clients (such as push-to-talk mobile clients) in a given region. In a preferred embodiment, such support exists notwithstanding that at least some of the clients are able to present any of a plurality of differing user identifiers. In particular, differing user identifiers are nevertheless recognized and used by the SIP proxy(ies) to effect compatible provision of a service such as push-to-talk services.
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