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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