<![CDATA[Strange VOIP Problem]]>Hi all,

I have a very strange VOIP Problem. Certain calls just won't get through to my PBX, allthough others do and I can call out.
It seems these calls originate only from a certain provider, wereas others work fine.
I've configured everything according to https://doc.pfsense.org/index.php/PBX_VoIP_NAT_How-to

I have a zyxel modem in Bridge mode <-> PFsense <- VLAN -> PBX and all SIP settings have been made on the PBX only.
As I said, I can call out to everyone, others can reach me from mobile phones, just a certain set of incoming calls will not get through.

In the PFsense firewall logs I see the following upon an incoming call from these particular callers:


Apr 7 11:36:51	WAN	  217.0.23.100	  <wanip>UDP
Default deny rule IPv4 (1000000103)
Apr 7 11:36:51	WAN	  217.0.23.100:5060	  <wanip>:5064	UDP
Default deny rule IPv4 (1000000103)
Apr 7 11:36:50	WAN	  217.0.23.100	  <wanip>UDP
Default deny rule IPv4 (1000000103)
Apr 7 11:36:50	WAN	  217.0.23.100:5060	  <wanip>:5064	UDP
Default deny rule IPv4 (1000000103)
Apr 7 11:36:50	WAN	  217.0.23.100	  <wanip>UDP
Default deny rule IPv4 (1000000103)
Apr 7 11:36:50	WAN	  217.0.23.100:5060	  <wanip>:5064	UDP
Default deny rule IPv4 (1000000103)</wanip></wanip></wanip></wanip></wanip></wanip>

I have even put an easy rule into the firewalls, but this won't change anything.


States	Protocol	Source	Port	Destination	Port	Gateway	Queue	Schedule	Description	Actions
IPv4 TCP/UDP	217.0.23.100	*	WAN address	5064	*	none	 	Easy Rule: Passed from Firewall Log View

Does anyone have an idea on what is going on here?

Thank you and kind regards,

SnakeZZ

]]>https://forum.netgate.com/topic/114193/strange-voip-problemRSS for NodeMon, 05 Oct 2026 11:43:49 GMTSat, 08 Apr 2017 12:43:09 GMT60<![CDATA[Reply to Strange VOIP Problem on Thu, 27 Apr 2017 17:18:08 GMT]]>NAT is not the best option to have VOIP server. NAT can have same bad influence in VOIP Package and hard to debug.

I my opinion just bridge WAN Port with the port that you have your VOIP server."Create a DMZ"
And than you can use the static IP from your ISP direct on your VOIP server.

Same Sample info about NAT and VOIP

https://www.voip-info.org/wiki/view/NAT+and+VOIP
http://kb.smartvox.co.uk/voip-sip/sip-nat-problem/

]]>https://forum.netgate.com/post/695860https://forum.netgate.com/post/695860Thu, 27 Apr 2017 17:18:08 GMT<![CDATA[Reply to Strange VOIP Problem on Thu, 27 Apr 2017 17:14:32 GMT]]>In addition to Birke's questions, which interface did you add that rule to?

]]>https://forum.netgate.com/post/695859https://forum.netgate.com/post/695859Thu, 27 Apr 2017 17:14:32 GMT<![CDATA[Reply to Strange VOIP Problem on Thu, 27 Apr 2017 08:35:40 GMT]]>Does it work if you modify the rule to


States	Protocol	Source	Port	Destination	Port	Gateway	Queue	Schedule	Description	Actions
IPv4 TCP/UDP	217.0.23.100	*	WAN address	*	*	none	 	Easy Rule: Passed from Firewall Log View

Do you have a NAT/Portforwarding where you have to add the source adress too?

]]>https://forum.netgate.com/post/695736https://forum.netgate.com/post/695736Thu, 27 Apr 2017 08:35:40 GMT<![CDATA[Reply to Strange VOIP Problem on Thu, 27 Apr 2017 06:02:25 GMT]]>Anyone?  :-\

]]>https://forum.netgate.com/post/695715https://forum.netgate.com/post/695715Thu, 27 Apr 2017 06:02:25 GMT