Maybe.. but, when I turn ON, I see fs_path-es for outer clients. If it is OFF, I never see fs_pathes.
Can you suggest, how to enforce "fs_path-es without aggressive-nat-detection"?

Also, I see another problem:
My friend in the Ukraine, uses phone behind NAT, too (situation like to Sipdroid - he also behind NAT).

There is his registration record:

Call-ID:        c4e76211@192.168.10.103
User:           1012@192.168.1.5
Contact:        "user" <sip:1012@192.168.1.136:1024;fs_nat=yes;fs_path=sip%3A1012%4091.207.244.1%3A1024>
Agent:          AcctonVoIP/2.5
Status:         Registered(UDP-NAT)(unknown) EXP(2010-05-24 17:49:15)
Host:           olegh.ath.cx
IP:             91.207.244.1
Port:           1024
Auth-User:      1012
Auth-Realm:     olegh.ath.cx
MWI-Account:    1012@192.168.1.5


When he calls me, everything is OK, we can talk each to other.
But, when I call him (from LAN), he receives RING signal, pick up handset -- and we both heard nothing.

Can you suggest, where to search?