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Allow <number> Concurrent
Call(s)
Enable ENUM Resolution
Clear Bindings Prior
Registration
Disable NAT Traversal
Anti-SIP Blocking
Gateway Trunk
Call Keep Alive
Registered Keep Alive
Delay Before/After
Answering
RFC2833 Payload Type
WAN LBR Preference
6.7 Analog PSTN Trunk configuration
An Analog PSTN trunk group is a logical group of one or more FXO or FXS PSTN subscriber lines
connecting to FXO or FXS ports on IP PBX.
The Analog PSTN Trunk Management page allows the administrator to configure PSTN trunks.
Select Trunk -> Analog PSTN Trunk, and one can add, edit and delete PSTN trunks. Go to Service
-> IP PBX Service, and click Reload to activate changes.
6.7.1 Add an Analog PSTN Trunk
1.
Click the Add New tab.
Select Call Admission Control and enter a number for allowed
concurrent calls.
Select to use ENUM resolution, or leave it as blank.
If failed to the registration and cannot identify any abnormal settings,
select to un-register before registering again.
IP PBX uses NAT traversal for outgoing traffics by default. Select to
disable NAT traversal if media ports in SDP are trusted.
Select to ignore illegitimately inserted CANCEL messages from ISP.
Select to (1) trust the peer if IP matches and (2) retain caller ID.
Select to check if the call is still ongoing in a certain time.
Select to check the registration status in a certain time.
Delay in seconds before and after answering a call from SIP trunk.
The default payload type is 101. Enter a value between 96 and 127 to
change the default payload type when selecting DTMF mode as RFC
2833 or Auto.
Select a low bit rate codec to be used as the first priority for outbound
calls. e.g. select Auto to use caller's low bit rate codec, if any, or G.729
as the first priority.
To use WAN LBR Preference on a SIP trunk, the WAN Bandwidth
Saver function must be enabled.
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