VoIP newbie seeks advice!


I've just bought a Sipura SPA 3000 after having a play around with XLite and being quite happy with VoIP (using 1899.com).

However, when I make a call over VoIP, the person I'm calling can hear me, but I can't hear them.

From looking around the web, it sounds like this is a common problem when a hardware VoIP device is behind an NAT (as mine is). However, I haven't really found a solution in works of one syllable! (I really am very new at this whole VoIP thing).

My internet connection is via a cable modem (2Mb down, 512Kb up), and the cable modem is plugged into a Linksys BEFSR41 router. My SPA 3000 is plugged into one of the ports on this router.

I've heard that a STUN server should be able to get around NAT problems, but although I've set a STUN server in the SPA config, I still get the same problem.

My router supports uPnP, which, again, I understand should make things easier! (I also know very little about uPnP I'm afraid!).

I get the same problem with a couple of different SIPs I've tried.

Does anyone have any ideas? Am I correct in thinking it's a NAT problem? Is it worth me putting the SPA in the DMZ and see if that works? Otherwise, do I need to forward any ports to the SPA? (although I thought STUN and/or uPnP got around this problem!).



Reply to
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I've set "Insert VIA rport" and "Send Resp To Src Port" to "yes" (SIP -> NAT Support Parameters). That's gotten it working through NAT for me.


Reply to
Kyler Laird

What port have you set for the STUN server..?

Same here, but my router doesn't support it so can't say..!


Yes, try it, definitely. My SPA-2000 seems to require this on Sipgate.

*In addition* try forwarding ports 5004-5005, 5060-5061, 8000-8019 plus whatever port the STUN server wants. Default is 3478 although Sipgate uses 10000.


Reply to
Ivor Jones

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