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2N TELEKOMUNIKACE a.s., www.2n.cz 49/117
SIP Transport Protocol – set the SIP communication protocol: UDP (default), TCP
or TLS.
Local SIP Port – set the local port for the device for SIP signaling. A change of
this parameter will not be applied until the device is restarted. The default value
is 5060.
PRACK Enabled – enable the PRACK method for reliable confirmation of SIP
messages with codes 101–199.
REFER Enabled – enable call forwarding via the REFER method.
Send Keep Alive Packets – set that the device shall inquire periodically about the
state of the called station via SIP OPTIONS requests during the call (used for
station failure detection during the call).
IP Address Filter Enabled – enable the blocking of SIP packet receiving from
addresses other than SIP Proxy and SIP Registrar. The primary purpose of the
function is to enhance communication security and eliminate unauthorized
phone calls.
Receive Encrypted Calls Only (SRTP) – set that SRTP encrypted calls shall only
be received on this account. Unencrypted calls will be rejected. At the same
time, TLS is recommended as the SIP transport protocol for higher security.
Encrypted Outgoing Calls (SRTP) – set that outgoing calls shall be SRTP
encrypted on this account. At the same time, TLS is recommended as the SIP
transport protocol for higher security.
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