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Value Range
1–65535
STUN External Address Detection Retry Counter
Specifies the number of times that a query is retried when no response is received from the STUN server.
Value Range
0–8
STUN Resending Interval
Specifies the length of time until a query is retried when no response is received from the STUN server.
Value Range
0–1600 ms
SIP Called Party Number Check Ability
Specifies whether to receive a SIP trunk call when receiving the INVITE message with an incorrect target
SIP-URI. The setting specified here is also applied when the request header is blank or contains characters
that can not be modified to a receivable number.
Value Range
Disable (High-
>Low), Disable (Low->High), Enable
Symmetric Response Routing Ability
Enables this feature to request that the SIP server sends the response back to the source IP address and port
from which the request originated.
Value Range
Disable, Enable
100rel Ability
Specifies whether to add the option tag 100rel to the header field of the INVITE message.
Value Range
Disable: This feature is not activated.
Enable (Active): Activates this feature only if the other device supports the feature.
Enable (Passive): Activates this feature only when requested by the other device.
Ringback Tone to Outside Caller
Enables the PBX to send a ringback tone to an outside caller when the network cannot send the tone.
Value Range
Disable, Enable
44 Programming Manual for Virtual SIP Trunk Card
3.3.1 Main