One Chunnel GSM VoIP Gateway
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A） Signaling Port (SIP Local port)
The default SIP port is 5060. Change this as required.
B） NAT Keep-alive
The NAT Keep-alive feature sends a null packet to the SIP Proxy periodically in order
to keep the NAT open for incoming data traffics.
C） Advanced Timing Settings
Some SIP proxies may have special timing requirements. Change these parameters
as required.
D） Signaling Qos
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