22
Advanced
Enable SIP Replaces Default is
Yes
. Setting this option to
No
, will instruct the PBX
not to use the SIP replace header. Some PBXes try to take over
the bridging functionality from KX-HDV800 using this command,
which causes the calls to interrupt.
Enable Blind Transfer Default is
Yes
. Setting this option to
No
, will disable the transfer
function (
(
MENU
)
>
TRANSFER
) during a call. This may be
used if the PBX does not support blind transfer.
Transport
The transport setting only concerns the protocol to be used for SIP messages between
the devices involved. These settings do not include the media (the actual call). The
settings on the Media tab should be set accordingly.
Note that if you choose to use a secure connection, both units must support it.
Otherwise they cannot negotiate a connection. If an incoming call demands a secure
TLS or SIPS connection, the KX-HDV800 uses the appropriate protocol even if you
have set the phone to use UDP.
Protocol
UDP
(
User Datagram Protocol
) is a protocol on the transport
layer in the Internet Protocol Suite. It is a stateless protocol for
short messages – datagrams. Stateless implies that it does not
establish any connection between sender and receiver in ad-
vance. UDP does not guarantee reliability or ordering in the way
that TCP does. Datagrams may arrive out of order or go missing
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UDP is the default protocol for SIP.
TCP
(
Transmission Control Protocol
) is a protocol on the
transport layer in the Internet Protocol Suite. TCP is the standard
protocol for Internet communication. TCP keeps track of all
individual packets of data, ensuring that they reach the receiver
and are put together properly. TCP is not the default protocol for
SIP, because it is slower and uses more bandwidth than UDP.
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TLS
(
Transport Layer Security
) is a cryptographic protocol that
provides security and data integrity for communications over
TCP/IP networks. TLS encrypts the datagrams of the transport
layer protocol in use. The secure connection may be to the end
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phone is registered). There is no guarantee that there is a secure
channel to the end point, but because the SIP server is the only
part receiving the user authentication, this is still a rather secure
solution.
SETTINGS
