ACK is not receiving on Proxy, It directly goes to UAS and get in loop at Proxy 
before relayed to bob. Can you explain why ACK is going directly to UAS while 
all other responses going to proxy?
   Alice            Proxy             UAS              Bob     |                
|                |                |     |   INVITE       |                |     
           |
     |--------------->|   INVITE       |                |
     |     100        |--------------->|                |
     |<---------------|   INVITE       |                |     |                
|<---------------|                |     |                |                |     
           |     |                |              INVITE             |     |     
           |-------------------------------->|     |                |           
     |                |
     |                |               180               |
     |                |<--------------------------------|     |                
|                |                |     |                |      180       |     
           |     |                |--------------->|                |     |     
           |                |                |     |                |      180  
     |                |
     |      180       |<---------------|                |
     |<---------------|                |                |     |                
|               200               |
     |                |<--------------------------------|     |                
|                |                |     |                |      200       |     
           |     |                |--------------->|                |     |     
           |                |                |     |                |      200  
     |                |
     |                |<---------------|                |     |       200      
|                |                |     |<---------------|                |     
           |     |                |                |                |     |     
          ACK               |                |
     |-------------------------------->|                |     |                
|       ACK      |                |
     |                |<---------------|                |
     |                |                |                |     |               
ACK               |                |     |                |                |    
            |     |               ACK               |                |     |    
            |                |                |     |               ACK         
      |                |     .                .                .                
.     .                .                .                .     .                
.                .                .
     
RegardsHamid R. Hashmi                                    
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