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Advanced – Parameters
VoIP through IP Interface: IP Interface decides where to send/receive the voip trafc; it includes:
ipwan and iplan. Easy way to select the interface is to check the location of the SIP server. If
it locates some where in the Internet then select ipwan. If the VoIP SIP server is on the local
Network then select iplan.
Voice Frame Size: Frame size is available from 10ms to 60ms. Frame size meaning how many
milliseconds the Voice packets will be queued and sent out. It is ideal to have the same frame
size in both of Caller and Receiver.
Dial Plan Priority: Dene the priority between VoIP and PSTN dial plan.
PSTN Auto-fallback: Whenever VoIP SIP responses error and error code matching with the
codes in the Edit section, the VoiP calls will automatically fallback to PSTN. In the other word, the
call will be called via the PSTN when VoIP SIP returns an error code.
Click the Edit to add or remove the responses code. To be sure the code is separated by a
comma (,).
For more information about SIP responses codes, please check to link to http://voip-info.
org/wiki/view/sip+response+codes where you can get to know the meaning of each error code.
T.38 Fax Relay: It allows the transfer of facsimile documents in real-time between two standard
Group 3 facsimile terminals over the Internet or other networks using IP protocols. It will only
function when both sites are support this feature and enabled.
Advanced – PSTN Environment Adjustment
PSTN Environment Adjustment options will help you to adjust the onhook and offhook voltage
detection values for your environment. You should use these if the default values are incorrect
and result in PSTN calls not being detected properly, e.g. calls being terminated within 5 seconds
of being answered. The actual levels are determined by your environment including the number
and type of telephones used.
Note: ONHOOK means hung up.
To take your phone OFFHOOK, lift the receiver then press Hook/Flash until you hear your normal
