Half the time can't answer incoming calls to Obi110 phone [-RESOLVED-]

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RonR:
earthtoobi,

The problem is with the SIP protocol being designed with absolutely no regard or support for NAT routers.  With no port forwarding, a router has no idea where to send unsolicited UDP packets.  Yes, ATA's can send keep-alive packets in an attempt to keep ports routed to the right place, but there's still many ways for RTP packets to miss their mark due to the way SIP spawns RTP streams.  The bottom line is it's very very difficult (maybe impossible?) to build a NAT router that's 100% bullet-proof the way the SIP/RTP protocol is designed.  Some routers are better others.

There's usually multiple ways to solve a problem, but in this case, I prefer to forward SIP/RTP ports right from the beginning before any problems arise.

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