Routing Hints

An exemplary network gateway is capable of accepting a session-related message having a session identifier field; the network gateway is adapted to extract a host identifier from a value populating the session identifier field and to perform a routing operation for the session-related message using the host identifier. For an exemplary media implementation, processor-executable instructions direct a device 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. An exemplary apparatus includes: at least one processor; and one or more media including processor-executable instructions that are capable of being executed by the at least one processor to direct the apparatus to perform actions including: receiving a session message having a session identifier including a host identifier; and routing the session message responsive to the host identifier.