[c-nsp] Voice header compression Problem with IETF encapsulation

[Yasser Aly]

Hello,
 
  I am trying to apply rtp header compression on a frame-relay interface.
 
I am using the configuration below but error popping shows that header compression is not supported with IETF encapsulation. I have to use IETF as the other end of this connection is over ATM interface so Frame-Relay to ATM internetworking is in the middle. What can be done to solve this problem? 
 
Configuration Below:
==============
 
 
interface Serial0/0
 no ip address
 encapsulation frame-relay IETF
 no fair-queue
 frame-relay traffic-shaping
 frame-relay lmi-type ansi
 
error message while adding the ip rtp header compression or fr ip rtp header compression:
 
Router(config)#interface Serial0/0
Router(config-if)#ip rtp header-compression    
 
%Interface is set for IETF encapsulation! IP header compression is supported only over CISCO encapsulation! 

Router(config-if)#
Router(config-if)#frame-relay ip rtp header-compression 
%Interface is set for IETF encapsulation! IP header compression is supported only over CISCO encapsulation!