[SIPForum-discussion] Unable to receive RTP Stream over NAT

[Anuroop]

Hello Anil.

   --> What type of NAT are you benind?  It is is symmetric NAT, STUN may
not be sufficient.
   -->  For every RTP port to receive data, there should be an RTCP port for
receiving control packets.
   -->  You need to create pin holes for the media to get pass through once
ports are identified.

Regards,
Anuroop.


  -----Original Message-----
  From: discussion-bounces at sipforum.org
[mailto:discussion-bounces at sipforum.org]On Behalf Of anilkumar mantena
  Sent: Thursday, April 05, 2007 8:09 PM
  To: discussion at sipforum.org
  Subject: [SIPForum-discussion] Unable to receive RTP Stream over NAT


  Hi all,

  I tried to implement a program for RTP Streaming over Internet (VOIP).  I
am able to register with the proxy and establishing a session with INVITE.
But I'm not able to receive the voice and even I am not able to send voice.
  I used STUN (stun4j) to detect my public ip and public port using
addressDiscovery.determineAddress() method.  I tried by using private ip and
port; public ip and public port (found in STUN Discovery); and used Media IP
and Media Port (from SDP) to listen/send RTP stream over the Internet.
Still no use of it.  I'm unable to send/receive voice.
  1. What might be the problem?
  2. What are the ports I need to configure for Listening and for sending?
  3. When I should do STUN Discovery?
  4. Is Discovery process is sufficient or shall I do any binding (if yes
please mention the methods in stun4j)
  5. Any other solutions to solve this problem?

  Thanks in advance.....
  Anilkumar Manthena


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