[android-developers] Re: RTP Stream plays on WiFi but 3G netowrk - PLEASE,PLEASE,PLEASE HELP :(

hi, thanks for your reply,

If it does the NAT problem, why I can get the RTP packets but cannot
play them?

On Jul 5, 10:04 pm, Jarsa <jarsa.ja...@gmail.com> wrote:
> Hi,
> I don´t know the details of your implementation, but please be aware
> of this issue:
> SIP uses the SDP protocol to negotiate the codec, ports and IP that
> the RTP protocol will use to exchange data. When you are using the 3G
> operator's network you are behind NAT, this means that there will IP
> translation. BUT inside the SDP, the contact IP will be the one of
> your Smartphone.
> Take a close look on how SIP, SDP and RTP works!

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