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No audio using NEC SV8100 and NAT with SIP

I am trying to get my SIP phones to connect back to the office without the use of a VPN.  I can get the phones to register properly and they can make calls but there is no audio.  if I estabilish a VPN connection it works perfect.

Any Ideas?

I was using an RV082 router and now it is a ER6120 by TP-Link ... same results for both.

Thanks,

Dave
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DIBSI
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DIBSI
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DIBSIAuthor Commented:
I read all 3 posts and they seem more geared to carriers vs end users.

I have an NEC SV8100 telephone system and a SIP client on my cellular phone with an ER6120 router.

If I VPN in everything is great however I do not want to run the vpn client on my phone all the time.

TP-Link is telling me that their router will handle SIP no problem.
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agonza07Commented:
Take a look at page 52 for SIP. Is this enabled?

http://www.tp-link.com/Resources/document/TL-ER6120_v1_UG.pdf
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DIBSIAuthor Commented:
Yes it is, everything is enabled just as it shows on P 52, I also tried disabling it as I read that some routers do not handle SIP properly, but ways did not work :(
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agonza07Commented:
You are going to need to sniff the traffic on both the inside and outside interfaces.

www.wireshark.org

Once you get the packet captures we can see what exactly is going on.
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DIBSIAuthor Commented:
I have not had a chance to do this yet ... If i mirror the switch port and send you the capture files will you be able to have a look at it?
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DIBSIAuthor Commented:
I never got it to work without the VPN, I have the VPN back up and running and the VOIP has been flawless for about 7 months now.  NEC Tech support could not get it working nor could my telephone provider, I think it is a firmware problem in the NEC system.
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DIBSIAuthor Commented:
solutions provided did not solve the problem and I don't think it is solvable as I stated in my last post.
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