Replacing an attribute in the SDP

Hello,

We need to replace a=sendrecv with a=sendonly in the 200 OK reply to an
INVITE. In theory it should be something straightforward, like in the
onreply_route using:

replace_body_all( "a=sendrecv", "a=sendonly" );

or:

subst_body( '/^a=sendrecv/a=sendonly/' )

Our first problem is that these both are appending a=sendonly to the end of
the SDP, not replacing values within it. Does anyone know why this might
happen?

Our second problem is that we really only want to do this for video media,
and not touch the audio media. Are there any text tools that allow you to
work with specific media within the SDP?

Thanks in advance for any tips!

-- 
David Cunningham, Voisonics Limited
http://voisonics.com/
USA: +1 213 221 1092
New Zealand: +64 (0)28 2558 3782

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