Send a directed message

When you send a directed message (account_send_message in the Vivox SDK), you need to know the URI of the participant, which starts with "sip:" and ends with "@mt1s.vivox.com".

The following code displays an example of the user Alice sending a directed message to the user Bob:

[SDKSampleApp]: message -u sip:.xyzzy.bob.@mt1s.vivox.com -m "hey bob"
* Sending directed message 'hey bob' to user sip:.xyzzy.bob.@mt1s.vivox.com
* Issuing req_account_send_message with cookie=3

Bob sees the message as a user_to_user_message event:

* evt_user_to_user_message: .xyzzy.bob. sip:.xyzzy.sa_c78d1595.@mt1s.vivox.com - hey bob
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