H323.conf --------------------
[general]
port=1720
disallow=all
allow=g729
allow=gsm
dtmfmode=inband
gatekeeper=disabled
AllowGKRouted=yes
AcceptAnonymous=yes
context=h323incoming
progress_setup=3
progress_alert=8
progress_audio=yes
tunneling=cisco


[208.45.130.100]
type=friend
port=1720
host=208.45.130.100
incominglimit=4
;h245Tunneling=no

[208.45.130.200]
type=friend
host=208.45.130.200
port=1720

extensions.conf ----------------
[h323incoming]
exten => _x.,1,Answer()
exten => _x.,2,Wait(3)
exten => _x.,3,SayDigits(1234)
exten => _x.,4,Hangup

tcpdump -----------------------
20:08:12.826700 IP (tos 0x0, ttl 242, id 0, offset 0, flags [none], proto 6, length: 44) 208.45.130.100.40749 > 205.244.148.44.h323hostcall: S [tcp sum ok] 996792236:996792236(0) win 4128 <mss 536>
20:08:28.910095 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: S [tcp sum ok] 3508733459:3508733459(0) ack 996792237 win 5840 <mss 1460>
20:08:12.892566 IP (tos 0x0, ttl 242, id 24991, offset 0, flags [none], proto 1, length: 56) 208.45.130.100 > 205.244.148.44: icmp 36: host 208.45.130.100 unreachable - admin prohibited filter for IP (tos 0x0, ttl  50, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: [|tcp]
20:08:14.824579 IP (tos 0x0, ttl 242, id 0, offset 0, flags [none], proto 6, length: 44) 208.45.130.100.40749 > 205.244.148.44.h323hostcall: S [tcp sum ok] 996792236:996792236(0) win 4128 <mss 536>
20:08:14.824635 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: S [tcp sum ok] 3510731440:3510731440(0) ack 996792237 win 5840 <mss 1460>
20:08:14.889629 IP (tos 0x0, ttl 242, id 24999, offset 0, flags [none], proto 1, length: 56) 208.45.130.100 > 205.244.148.44: icmp 36: host 208.45.130.100 unreachable - admin prohibited filter for IP (tos 0x0, ttl  50, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: [|tcp]
20:08:18.824712 IP (tos 0x0, ttl 242, id 0, offset 0, flags [none], proto 6, length: 44) 208.45.130.100.40749 > 205.244.148.44.h323hostcall: S [tcp sum ok] 996792236:996792236(0) win 4128 <mss 536>
20:08:18.824769 IP (tos 0x0, ttl  64, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: S [tcp sum ok] 3514731575:3514731575(0) ack 996792237 win 5840 <mss 1460>
20:08:18.890604 IP (tos 0x0, ttl 242, id 25014, offset 0, flags [none], proto 1, length: 56) 208.45.130.100 > 205.244.148.44: icmp 36: host 208.45.130.100 unreachable - admin prohibited filter for IP (tos 0x0, ttl  50, id 0, offset 0, flags [DF], proto 6, length: 44) 205.244.148.44.h323hostcall > 208.45.130.100.40749: [|tcp]