User manual

VOPTech Document Four Channel’s GSM VoIP Gateway
Copyright@2009 VOPTel Technology Co., Ltd All Rights Reserved.
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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
Signaling QoS improves the performance of SIP signaling. If local network device