No VOIP call established

Maurice

Hello all

We are using pfsense for a short while now and im very satisfied with the product.
For now im expiencing a problem that i cant solve, so i hope you guys can help me out.

We have replaced an Cisco ASA with a PFsense firewall on the costumers site.
Since there was nothing configured on the ASA on natting or routing or what so ever we have not configured this either on the new PFsense.
Everything works except for the VOIP.

There is an Asterisk PBX 11.23.1 behind the PFsense and there are voip phones.
When we make a call then we see that the rings. When they pick up the Phone the conversation is ended immediatly.

We have made a packet capture and we see that the PBX answered:
Status: 486 Busy Here

We have tried the following:

Created a nat for the RTP ports: 49152 - 49407
Created a nat for port: 5066 (TCP and UDP)
Disable source port rewriting
Set Conservative state table optimization
Tried the siproxd
Disable scrub

We have put the ASA back in place and now VOIP is working again.
We would like to have the PFsense back in place

Can anyone help?

Regards,
Maurice

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Maurice

Extra info:

We have tested this again.
When calling trough the site-to-site VPN connection everything goes well.