+ * \verbatim
+ * SIP Dial string syntax:
+ * SIP/devicename
+ * or SIP/username@domain (SIP uri)
+ * or SIP/username[:password[:md5secret[:authname[:transport]]]]@host[:port]
+ * or SIP/devicename/extension
+ * or SIP/devicename/extension/IPorHost
+ * or SIP/username@domain//IPorHost
+ * and there is an optional [!dnid] argument you can append to alter the
+ * To: header.