Thanks for your Reply.
I called Voxbeam and they reply me with following answer.
Per our phone discussion please see below the following trace. If you notice in the INVITE dialog there's an internal IP address that you setting in the Via header. When the re-INVITE gets sent back it's being pointed back to your internal IP address instead of your public. You need to either remove the internal IP address and replace it with your public address or completely remove your Via header from your INVITE dialog.
U 2014/03/02 16:06:30.802256 xx.xx.xx.x:5062 -> 108.59.2.133:5060
INVITE sip:0011101917600665927@sbc.voxbeam.com SIP/2.0.
Call-ID: 71456966@10.1.10.185.
Content-Length: 171.
CSeq: 8001 INVITE.
From: "Raj Patel" <sip:+14848759610@sbc.voxbeam.com>;tag=SP37f937057ffff0131.
Max-Forwards: 70.
To: <sip:0011101917600665927@sbc.voxbeam.com>.
Via: SIP/2.0/UDP 10.1.10.185:5062;branch=z9hG4bK-5cf5f497;rport.
User-Agent: OBIHAI/OBi202-3.0.1.4303.
Contact: "Raj Patel" <sip:sbc.voxbeam.com@10.1.10.185:5062>.
Expires: 60.
Supported: replaces.
Allow: ACK,BYE,CANCEL,INFO,INVITE,NOTIFY,OPTIONS,PRACK,REFER,UPDATE.
Content-Type: application/sdp.
How can I remove header Information? Anybody has any idea?
Thanks,
Raj