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VoIP over TMG 2010 VPN

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Hi!

I'm having an issue with VoIP calls via TMG 2010 PPTP VPN. I have internal IP PBX and I want that I could register softphone to IP PBX through TMG VPN and make calls. At the moment softphone can register to IP PBX, I can make calls from internal phone to softphone though TMG VPN and from softphone to internal phones, but on internal phone I can't hear anything when I'm talking on softphone, but if i'm talking on internal phone I can hear on softphone. Where is the problem? Any ideas?

Rules looks like that:

1. Protocol RTP from ( VPN Clients ) --> to (IP PBX);

2. Protocol RTP from ( VPN Clients, IP PBX ) --> to (VPN Clients);

3. Protocol SIP from ( VPN Clients, IP PBX ) --> to (VPN Clients, IP PBX);

Regards


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