catch dtmf from audio port

[amar]

Hi,

I am writing a pipeline which is receiving rtp PCMU on one port and rtp
H263p on other port and mux it into a .mpg file. Up to this part its
working fine.
I want to catch rtp DTMF which come on the same port which used to receive
PCMU. I wrote bus watch function for catching GST_MESSAGE_ELEMENT singnal,
But I am unable to get it.
How can I catch the DTMF value come on audio port ?

Thanks,
Amar
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