Asterisk 1.8.4-rc3 and IAX2 registration

Hi to everybody,
I am new in this forum…

First of all…sorry for my english…

I have a problem with Asterisk 1.8.4-rc3 and IAX2 clients registration.
My system is:

OS: Ubuntu 11.04 64 bit
LAN IP 1: 192.168.5.8
LAN IP 2 (HeartBeat for HA): 192.168.5.10

the are no rule in IPTABLES…

All the SIP clients are registered and the system work perfectly…

Now I would like to use IAX2 clients for remote workers (I have tried with sip clients but if the remote worker calls a client inside the lan all is ok, instead if a client inside the lan calls a remote worker I have one way audio, remote worker can hear the client inside but no viceversa…why? ) to avoid problem of one way audio whit sip and nat…

The problem is the registration of IAX2 clients on asterisk…
At this time I am making some tests inside the lan and the client are softphone (zoiper and SFLphone)
My iax.conf is:

[general]
bindport=4569
bindaddr=192.168.5.10
delayreject=yes
language=it
disallow=all
;jitterbuffer=no
;forcejitterbuffer=no
;rtcachefriends=yes
;rtautoclear=yes
localnet=192.168.5.0/255.255.255.0
externip=my_static_public_ip

[246]
type=friend
host=dynamic
username=246
secret=password123
context=internal
qualify=yes
requirecalltoken=auto
allow=alaw
allow=ulaw
allow=gsm

enabling IAX2 debug in Astersik cli I have:

Rx-Frame Retry[ No] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00003ms SCall: 20384 DCall: 00000 [192.168.5.200:4569]
USERNAME : 246
REFRESH : 120

Tx-Frame Retry[000] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: REGAUTH
Timestamp: 00003ms SCall: 04093 DCall: 20384 [192.168.5.200:4569]
AUTHMETHODS : 1
USERNAME : 246

Rx-Frame Retry[Yes] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00003ms SCall: 20384 DCall: 00000 [192.168.5.200:4569]
USERNAME : 246
REFRESH : 120

Tx-Frame Retry[-01] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: ACK
Timestamp: 00003ms SCall: 04093 DCall: 20384 [192.168.5.200:4569]
Rx-Frame Retry[Yes] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00003ms SCall: 20384 DCall: 00000 [192.168.5.200:4569]
USERNAME : 246
REFRESH : 120

Tx-Frame Retry[-01] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: ACK
Timestamp: 00003ms SCall: 04093 DCall: 20384 [192.168.5.200:4569]
Tx-Frame Retry[001] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: REGAUTH
Timestamp: 00003ms SCall: 04093 DCall: 20384 [192.168.5.200:4569]
AUTHMETHODS : 1
USERNAME : 246

Rx-Frame Retry[Yes] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00003ms SCall: 20384 DCall: 00000 [192.168.5.200:4569]
USERNAME : 246
REFRESH : 120

Tx-Frame Retry[-01] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: ACK
Timestamp: 00003ms SCall: 04093 DCall: 20384 [192.168.5.200:4569]
Rx-Frame Retry[ No] – OSeqno: 000 ISeqno: 000 Type: IAX Subclass: REGREQ
Timestamp: 00003ms SCall: 20385 DCall: 00000 [192.168.5.200:4569]
USERNAME : 246
REFRESH : 120

Tx-Frame Retry[000] – OSeqno: 000 ISeqno: 001 Type: IAX Subclass: REGAUTH
Timestamp: 00003ms SCall: 02467 DCall: 20385 [192.168.5.200:4569]
AUTHMETHODS : 1
USERNAME : 246

and so on…

Can someone help me?..

Thanks a lot…