2N Indoor Talk User Manual page 43

SIP Transport Protocol – set the SIP communication protocol: UDP (default), TCP
and TLS.
Local SIP port – set the local port for SIP signalling. 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 (reliable confirmation of SIP
messages with codes 101–199).
REFER Enabled – enable call forwarding via REFER.
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 blocking of SIP packet receiving from
addresses other than the SIP Proxy and SIP Registrar ones. Primarily used for
higher communication security and preventing unauthorised phone calls.
Receive encrypted calls only (SRTP) – set that SRTP encrypted calls shall only
be recieved on this account. Unencrypted calls shall 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.
Do not play incoming early media – disable playing of the incoming audio stream
before the call sent by some PBXs or other devices is picked up (early media). A
standard local ringtone is played instead.
QoS DSCP Value – set the SIP packet priority in the network. The set value is
sent in the TOS (Type of Service) field in the IP packet header. Enter the value as
a decimal number. The change will be applied after the device restart.
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