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-Inter-Asterisk eXchange Protocol
-================================
-
-Usage:
-======
-The format for the dialing string on Asterisk is:
-IAX/[user@]peer[:exten[@context]]
-
-(Note, []'s denote optional fields).  The peer is either an IP address
-or a peer as specified in the /etc/asterisk/iax.conf file.  Exten is
-an optional requested extension (otherwise "s" will be used), and 
-"context" is an optional context to request.  The user is an optional
-username specified in the peer's iax.conf.  If the user is not specified,
-the peer will select one.
-
-The peer uses a score to determine the best user entry to match against if
-one is not specified:
-
-1. User entry with secret and no ACL specified.
-2. User entry with secret specified and ACL specified.
-3. User entry with no secret specified and no ACL specified.
-4. User entry with no secret specified and ACL specified.
-5. User entry matched via username.
-
-The higher the score the better it is with 5 being an exact match and the maximum
-score possible.
-
-Protocol and rationale:
-=======================
-IAX is a simple, low overhead and low bandwidth VoIP protocol designed to 
-allow multiple Asterisk PBX's to communicate with one another without
-the overhead of more complex protocols like H.323.  Payload is sent with
-a header overhead of only 4 octets.  Control functions (and one payload packet
-per minute or so) is sent with a more complex header of 12 octets.
-
-IAX is slightly stateful.
-
-IAX contains two kinds of packets:  The full header packet type, which 
-contains much information about the frame, in addition to its contents,
-and the mini header type, which is used only for non-reliable voice
-packet delivery.
-
-All packets are immediately transmitted.  Packets are received, but not
-delivered to the actual channels until a given time quantum has passed, in
-order to try to eliminate jitter.
-
-All full header packets must be ackd (except, obviously for the ACK packets
-themselves and not so obviously for hangup packets).  The "timestamp" field of
-ack packets is not the normal offset, but rather a quote of the timestamp as
-included with the original packet that you're acking, and likewise the
-seqno field is the seqno of the packet you're acking, not your own seqno,
-and you do not increment your own sequence number.  ACKing is based on the
-sequence number.
-
-See iax.h for a description of the frame formats. 
-
-IAX internal frames use the AST_FRAME_IAX type.  The subclass of these
-frames is the IAX control number, as seen in iax.h.  The first frame sent
-must be an AST_FRAME_IAX with the control AST_IAX_CONTROL_NEW.  
-
-The AST_IAX_CONTROL_NEW establishes a new connection.  
-
-The first frame sent MUST be an AST_CONTROL_NEW to start a connection.
-
-IAX connnections may require authentication using either simple plaintext
-passwords or an md5 challenge/response pair.
-