[SR-Users] Contact Header

[KamDev Essa]

My scenario is 
UA <====> Kamailio <====> Freeswitch 
UA calls a number. Kam delivers to FS and FS plays a wav file. 
My problem is that Kam relays the 200 OK from FS back to UA without change and UA ACKs back to FS because the FS IP is in the Contact Header.    
   - Why does Kam not change the contact header since the ACK should come back to Kam
   - If this is normal what do I need to do to change the contact header for the 200K to the UA to make this work.
KD 
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