These are the ports that need to be forwarded for the NEC SL2100 telephone system. These ports are required for both SIP trunks and for remote NEC SL2100 VoIP phones.
For help finding the IP address of your NEC SL2100 follow this link.
SIP Signaling Rule – 5060 UDP – Forwarded to private IP address of the NEC SL2100.
Some SIP trunk providers will use 5090 or 5064 instead of 5060.
SIP Media Rule – 10020-10531 UDP (RTP) – Forward to private IP address of VoIP DSP
SIP ALG should be disabled in the firewall/router.
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