[OpenSIPS-Users] Private Call System with OpenSIPS

[H Yavari]

Hi to all,
One of the major problems of implementing VoIP systems in middle east and some countries is that SIP and RTP traffic is blocked in the core routers, even some application like Viber,IMO is blocked. So the customers can't use VoIP technology for communication between their employers or offices that are oversea. 

I want to know that what is your solution for this situation? users and OpenSIPS team that are working in this field for many years.So it is possible to use OpenSIPS to implement a private communication system ?
And other question is What is the mechanism of blocking ? changing the header of messages help to solve the problem?
This question is not related to OpenSIPS directly but the main problem of us for proposing OpenSIPS are this restrictions.
Regards,H.Yavari
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