● If Yes to All SIP, all outgoing SIP messages will include the phone’s MAC address in the User-
Agent header.
● If No, the phone’s MAC address will not be included in the User-Agent header in any outgoing SIP
messages.
The default setting is “No”.
SIP Transport
Selects the network protocol used for the SIP transport.
The default setting is “UDP”.
Enable TCP Keep-alive
Configures whether to enable TCP Keep-alive for the TCP connection between the terminal and the
SIP server.
SIP Listening Mode
Configures whether or not to listen to multiple SIP protocols.
● If set to “Dual“, phone will listen to TCP when UDP is selected.
● If set to “Dual (Secured)“, phone will listen to TLS/TCP when UDP is selected. If “TCP” or
“TLS/TCP” is selected, UDP will be listened too.
● If set to “Dual (BLF Enforced)“, phone will try to enforce BLF subscriptions to use TCP protocol
by adding ‘transport=tcp’ to the Contact header.
The default setting is “Transport Only”.
Local SIP Port Configures the local SIP port used to listen and transmit.
SIP URI Scheme when using
TLS
Specifies if “sip” or “sips” will be used when TLS/TCP is selected for SIP Transport. The default
setting is “sips”.
Use Actual Ephemeral Port in
Contact with TCP/TLS
Configures whether the actual ephemeral port in contact with TCP/TLS will be used when TLS/TCP is
selected for SIP Transport.
The default setting is “No”.
Support SIP Instance ID
Configures whether SIP Instance ID is supported or not.
The default setting is “Yes”.
SIP T1 Timeout
SIP T1 Timeout is an estimate of the round-trip time of transactions between a client and server. If no
response is received the timeout is increased and request re-transmit retries would continue until a
maximum amount of time define by T2. The default setting is 0.5 seconds.
SIP T2 Timeout
SIP T2 Timeout is the maximum retransmit time of any SIP request messages (excluding the INVITE
message). The re-transmitting and doubling of T1 continues until it reaches the T2 value. Default is 4
seconds.
Outbound Proxy Mode
Configures whether to put the Outbound Proxy in the Route header, or if SIP messages should always
be sent to Outbound Proxy.
1. In route
2. Not in route
3. Always send to
Default is “in route”.
Enable 100rel
When enabled, the 100rel tag is appended to the value of the Supported header of the initial signaling
messages.
The default setting is “No”.
Use Route Set in Notify (Follow
RFC 6665)
Configures whether to use route set in NOTIFY (follow RFC 6665).
● If enabled, the Request URI of the refresh subscription will use the URI in the received NOTIFY
Contact (RFC 6665).
● If disabled, the URI in the previously subscribed 200 OK Contact will be used.
Session Timer
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