Why does pfSense NAT re-write my SIP packet and mess up my registration?

[torontob]

Hi Everyone,

I have NAT forwarded 5060 TCP/UDP and 10000-20000 UDP to the Asterisk server that is setting as 192.168..0.5 and I do get a registration but it shows my pfsense IP as the registration IP rather than the client's public IP which comes through the WAN interface.

SIP Packet Example:

--- Transmitting (NAT) to 192.168.0.1:6258 --->
SIP/2.0 200 OK
Via: SIP/2.0/UDP 64.82.55.107;branch=z9hG4bK-d87543-855335637-1--d87543-;received=192.168.0.1;rport=6258
From: 9999-Prox106-Ast16<sip:5555@65.39.201.156>;tag=821bsd37
To: 9999-Prox106-Ast16<sip:5555@65.39.201.156>;tag=as7d4bdsdj37
Call-ID: f857e8783453453</sip:5555@65.39.201.156></sip:5555@65.39.201.156>

sip show peers:

pbx*CLI> sip show peers
Name/username              Host            Dyn Nat ACL      Port     Status     
5555/5555            192.168.0.1              D   N   A        5060     OK (13 ms) 

In sip_nat.conf I have:
externip=34.34.34.34
localnet=192.168.0.0/255.255.255.0

I do not have Siproxd installed as I understand it does just the reverse of what I need meaning it connects clients part of the pfsense to connect to outside world Asterisk rather than connecting outside world clients into the pfsense Asterisk.

Any pointers are much appreciated.

Thanks