modify sdp parameters for H264 interoperability

Hi guys

for some strange reasons my IWF is not working fine for video and when sbc(vmware) generates an INVITE versus openscape MCU it reply with port RTP 0 .

this is the original INVITE :

 

v=0
o=IWF 23 23 IN IP4 10.102.2.45
s=H323 Call
c=IN IP4 10.102.2.45
t=0 0
m=audio 10072 RTP/AVP 0 8 18
a=rtpmap:0 PCMU/8000
a=rtpmap:8 PCMA/8000/1
a=rtpmap:18 G729/8000/1
m=video 10074 RTP/AVP 31 34 255 96      <------------------
a=rtpmap:31 H261/90000
a=rtpmap:34 H263/90000/1
a=rtpmap:255 H264/90000/1           <-------------
a=rtpmap:96 genericVideo/90000/1

 

what i want to do is:

1) change in the m=video 10074 RTP/AVP 31 34 255 96  from 255 to 96

2)change from a=rtpmap:255 H264/90000/1 to a=rtpmap: