i'm facing strange behavior with Zoiper Client only in an IMS Kamailio based system.

in IMS call scenario (ims to ims) a lot of Loop Detect Msgs Appeared in the sip log.

while other clients like Acrobits did not occurred 

i'm using TCP protocol and Wireshark shows a lot of (TCP Re-transmission and TCP ACKed unseen Segment)  

Any Suggestion 

Thanks !