Each instance of this replicated attribute describes an encapsulation
method permitted for encapsulating the protocol data units (PDUs)
of an upper layer protocol when communicating with the remote
host identified by this Peer component. The index of a given
replicated instance of this attribute represents the relative priority of
the encapsulation method specified by the given attribute instance.
An attribute with index '1' has the highest priority, so the
encapsulation method described by it will be the first one attempted
when signalling a call to the link. If the protocolEncType is set to
IP to encapsulate IP traffic according to RFC1356, the
callUserData for this Peer component and the X25Dte component
must both be null, so that H.CC will be signalled as the call user
data of the call request. This indicates that the protocol
encapsulation type of IP is to be used for the channel.
A call received from the link will be accepted as long as the
encapsulation method indicated in the call user data of the incoming
call packet is included in one of these replicated attributes. (This
presupposes that the incoming call has been directed to the
RemoteGroup to which this Peer is linked through the
linkToRemoteGroup attribute.)