A first exemplary media implementation includes processor-executable instructions that direct a device to perform actions including: creating a session identifier (210) using a host identifier (214); and formulating a host session initiation message with the created session identifier. An exemplary device implementation includes: at least one processor; and one or more media including processor-executable instructions that direct the device to perform actions including: formulating a host session message with a session identifier that is created responsive to a host identifier; and sending the formulated host session message that includes the session identifier from the device. A second exemplary media implementation includes processor-executable instructions thai direct an apparatus to perform actions including: ascertaining a host identifier from a session identifier field of a session message; and routing the session message responsive to the ascertained host identifier.
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