Hi,
  Thanks for your reply, I understand that for outgoing call we can do this but 
ports will be open for limited period of time but if assume I want to receive 
call then how to do that?
I guess for that I require STUN client in my UA and STUN server in my 
Application server. My question is whether SIPP have STUN client in itself or 
how it will figure out public I.P of itself.

Regards
Chandra sekhar



-----Original Message-----
From: Annadanesh S Sankadal [mailto:[email protected]]
Sent: Tuesday, January 06, 2009 3:34 PM
To: Chandra Sekhar.Molli
Subject: RE: [Sip-implementors] how test SIP in NAT

Hi,

Just change the IP address in the Via header. Give any IP you want in Via
header and SDP also.

Via: SIP/2.0/UDP 99.99.99.5:[local_port];branch=[branch]

99.99.99.5 is dummy ip/priv ip

At the command prompt when you run SIPP, sipp -i <local-ip>,
Local-ip will be your actual ip of the machine ( NATted ip)

Rgds,
Annadanesh


-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Chandra
Sekhar.Molli
Sent: Tuesday, January 06, 2009 3:04 PM
To: [email protected]
Subject: [Sip-implementors] how test SIP in NAT

Hi,
    I  am doing Load testing with SIPP , But now setup got changed and I
want to test SIP behind NAT. Can any one please tell me whether SIPP works
with NAT ? If not can any one point me to the tool. Where I can generate
Load for SIP behind NAT.

Regards
Chandra sekhar

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