Voipserver: 193.84.95.110
Phone (31,32): 192.168.0.168
Phone (31,32) NAT: 193.84.95.6

Softphone (30): 192.168.10.101
Softphone (30) NAT: 91.14.95.132

Capture:
root@sfw1:~# tcpdump -v -ni any -s0 -w issue_24149.cap "host 193.84.95.110 and (host 192.168.0.168 or host 193.84.95.6 or host 91.14.95.132) and not port 22 and not port 80"
tcpdump: listening on any, link-type LINUX_SLL (Linux cooked), capture size 65535 bytes
^C280 packets captured
280 packets received by filter
0 packets dropped by kernel

Which procedure has been logged?

Registration of Softphone 30 to :5060
Registration of Snom 31 to :5060
Registration of Snom 32 to :5061
Four Calls:
	30 -> 31 (PJSIP -> PJSIP): not working
	30 -> 32 (PJSIP -> SIP): working
	31 -> 30 (PJSIP -> PJSIP): working
	32 -> 30 (SIP -> PJSIP): working