We are looking VOIP Tunnel software solutions to bypass voip calls in blockage area .
It is encrypts/decrypt SIP and RTP packets. So that enduser can make calls and bypass any firewall or port blockage area. We are looking experienced guy who already developed or worked on this . We already have dialers so looking tunnel solutions asap.
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You need to have two servers, one to encrypt and another to decrypt. I can do this easily for you. I can do this easily using asterisk modules for you. let me know more details of your requirement if interested.