Building and sending RTP Packet

Hi @ all,

i´m just tryin to build an rtp packet. Thats my Packet

typedef struct
{
u_int16_t profile_data;
u_int16_t length;
}rtp_xtn_hdr_t;

#pragma pack(push, 1)
typedef struct
{
u_int16_t v:2; /* protocol version */
u_int16_t p:1; /* padding flag */
u_int16_t x:1; /* header extension flag */
u_int16_t cc:4; /* CSRC count */
u_int16_t m:1; /* marker bit */
u_int16_t pt:7; /* payload type */
u_int16_t seq:16; /* sequence number */
u_int32_t ts; /* timestamp */
u_int32_t ssrc; /* synchronization source */
// u_int32_t *csrc;
}rtp_header;

typedef struct RTPPack
{
rtp_header rtphdr;
rtp_xtn_hdr_t *xtnhdr;
BYTE datap[198];
}RTPPACK, *PRTPPACK;

union DataPacket
{
RTPPACK rtpPack;
BYTE data[214];
};
#pragma pack(pop)

Now I want to send this with the sendto method from winsock.
that I do so after filling

m_rtpPack.rtpPack.rtphdr.v = 2;
m_rtpPack.rtpPack.rtphdr.seq = 12525;
m_rtpPack.rtpPack.rtphdr.cc = 0;
m_rtpPack.rtpPack.rtphdr.x = 0;
m_rtpPack.rtpPack.rtphdr.m = 1;
m_rtpPack.rtpPack.rtphdr.pt = 0;
m_rtpPack.rtpPack.rtphdr.p = 0;
m_rtpPack.rtpPack.rtphdr.ssrc = 25255563;
m_rtpPack.rtpPack.rtphdr.ts = GetTickCount();
m_rtpPack.rtpPack.xtnhdr = 0;

...
Getting Audio Sample
...
//Filling the DataBuffer
strcpy((char*)m_rtpPack.rtpPack.datap,szBuffer);

//sending packet to server via UDP Socket.
nSend = sendto(m_Socket, m_rtpPack.data, strlen(m_rtpPack), 0, (SOCKADDR*)&m_saRemote, sizeof(SOCKADDR));

But anything is wrong here. I can´t find out what but if i proof the network stream with packetyzer he can´t read the packet.

Can anyone see what I´m doing wrong or explain what is all to do to send a RTP packet through the net?

Greetings CrazyPlaya