UDP streaming instead of RTP streaming

[aikbeecisco]

Hi, I able to make RTP streaming by using xml services and  "RTPTx:......."  i get the streaming result and the protocol is RTP. But instead of using RTP as the streamming protocol, is it possible to making the transmit protocol as UDP without the rtp header?

[Gergely Szabo]

Hi,

why whould you do that?

G.

[aikbeecisco]

Hi gergely,

Because i have a  system that only can receive UDP packet, there is so difficult to change the system. So instead of changing the system, is it possible to change the protocol from RTP to UDP on cisco ip phone ?

[Gergely Szabo]

No.

[aikbeecisco]

how about the ip phone transmit a single UDP message to any destination?

[Gergely Szabo]

I don't understand. What are you trying to achieve?

G.

[Gordon Ross]

You do know that RTP is transmitted over UDP...?

GTG

[Gergely Szabo]

GTG, I thought so. But I was wrong. RTP may be transmitted over TCP as well (see the Wikipedia article).

Anyway, the OP wants to send raw UDP packets _without_ the RTP header.

G.

[Gordon Ross]

From what I've seen, Cisco use UDP for RTP transmission.

Yeah, I saw their request for raw audio without the RTP header. The OP's gonna have to ammend their listening software to extract the audio from the UDP/RTP stream. (Wireshark does it quite well )

GTG

[aikbeecisco]

Ya, hope someone can help, to change the RTP streamming into UDP streamming.

A.

[Gergely Szabo]

Cisco phones send RTP (within UDP). Get used to it.

G.

[aikbeecisco]

I agree with your statement, the difference is only the 12 byte RTP header, is there a way to strip the 12 bytes rtp header on the server side?

[Gergely Szabo]

Hi,

what server side?

You are talking directly to the Cisco phone. There's no configurable parameter of doing that.

You'll have to do that on your side.

G.

[aikbeecisco]

Hi,

Ok, do on my side, can u describe what was the step, so that i can achieve that?

A.

[Gergely Szabo]

I don't know. You'll have to implement something on a very low level, between the interface and the user process.

I would probably match and intercept such packets with iptables, take the payload and retransmit.

G.