Hello,
I have a problem with a DatagramPacket which receives incorrect bytes. I
made a capture with ethereal to see what is actually sent over the
network and I see a difference between what is captured with ethereal
and what is displayed with the following code:
DatagramSocket socket = new DatagramSocket(5062, 192.168.1.201);
byte[] buffer = new byte[65535];
DatagramPacket packet = new DatagramPacket(buffer, buffer.length);
try {
socket.receive(packet);
} catch (IOException e) {
e.printStackTrace();
}
InetAddress remoteAddress = packet.getAddress();
int remotePort = packet.getPort();
System.out.println(packet.getData());
Here is what is displayed with the previous code:
:SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.201:5060;branch=z9hG4bK4cdee679367a
Via: SIP/2.0/UDP 192.168.1.201:5064;branch=z9hG4bK-1-0_32755
From: sipp <sip:[EMAIL PROTECTED]:5064>;tag=32755_1
To: sut <sip:[EMAIL PROTECTED]:5062>;tag=1
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Contact: <sip:192.168.1.201:5062;transport=UDP>
Content-Type: application/tent-Type: application/sdp
Content-Length: 139
v=0
o=user1 53655765 2353687637 IN IPV4 192.168.1.201
s=-
c=IN IPV4 192.168.1.201
t=0 0
m=audio 6004 RTP/AVP 0
a=rtpmap:0 PCMU/8000
And here is what is captured with ethereal:
SIP/2.0 200 OK
Via: SIP/2.0/UDP 192.168.1.201:5060;branch=z9hG4bK4cdee679367a
Via: SIP/2.0/UDP 192.168.1.201:5064;branch=z9hG4bK-1-0_32755
From: sipp <sip:[EMAIL PROTECTED]:5064>;tag=32755_1
To: sut <sip:[EMAIL PROTECTED]:5062>;tag=1
Call-ID: [EMAIL PROTECTED]
CSeq: 1 INVITE
Contact: <sip:192.168.1.201:5062;transport=UDP>
Content-Type: application/sdp
Content-Length: 139
v=0
o=user1 53655765 2353687637 IN IPV4 192.168.1.201
s=-
c=IN IPV4 192.168.1.201
t=0 0
m=audio 6000 RTP/AVP 0
a=rtpmap:0 PCMU/8000
The first line and the header Content-Type do not match.
If anyone has already have the same type of problem, any help would be
appreciated.
I also had a problem with bea jrockit JVM, which
datagramPacket.getLength() was not corresponding to the actual content
length of the packet. I patched it with a loop over the bytes returned
with packet.getData(), and when I find a value of 0 for the current
byte, I consider the index of the current byte as the actual length of
data I can read from the packet.
Thanks a lot,
yohann
