6efb802a_Jingle_Relay_Nodes__Definition
[Attribute] id [Inclusion] REQUIRED on response, NOT RECOMMENDED on requests [Definition] 
A random candidate identifier generated by the Relay Service, which effectively maps to the created Channel; this SHOULD match the XML Nmtoken production See < http://www.w3.org/TR/2000/WD-xml-2e-20000814#NT-Nmtoken> so that XML character escaping is not needed for characters such as '&'. In some situations the Jingle session identifier might have security implications. See &rfc4086; regarding requirements for randomness.
Jingle Relay Nodes