firewall ports opening

  1. Firewal config - dual homed

    Hi, I'm having trouble understanding... We have a Windows installation which is dual homed. One network card is connected to the network where the provider's SIP TRUNK and SBC are and the other network card is in the DMZ and is reachable from the internet and internally. I have followed the...

  2. Inbound UDP port 9034 exposed by Realtek Jungle SDK Remote Code Execution Vulnerability

    Is anyone else getting this threat warning from your firewall? We are using Palo Alto FW, and this port has been hit constantly by bad actors trying to expose IOT devices. https://unit42.paloaltonetworks.com/realtek-sdk-vulnerability/ This port is only required if we use SIP Trunk / VOIP...
  3. AlphetaCS

    Poor Sound Quality or No Sound On External Calls

    I'm working to transition a client off of their existing system onto 3CX, but I'm running into sound issues. They started slow with just making external calls (nothing incoming) for about a week and it went well with the occasional complaint about sound quality. When I started forwarding all...

  4. RTP Media

    I am using a 3CX hosted system with local 3CX SBC. I am using flowroute for my SIP trunks and had a few calls where there was no audio. I had Flowroute trace the calls and they said it appeared there were no issues. Flowroute indicates that they use the method listed below for direct audio...

  5. Hosted 3CX firewall settings

    Are the requirements for local firewall settings for a hosted 3CX server [by 3CX] the same as a locally installed 3CX system? [regarding ports etc] I see the wiki for firewall configuration when 3CX is installed behind a firewall but not when it is hosted. In my situation, I am also using a...

  6. Firewall ports opening

    We are in the phase of migrating from cisco CME to 3CX. For security reasons the 3CX PBX is in a DMZ network and connects to the current CME via generic SIP trunk. The phones are also on the local LAN and pass through the firewall to reach the 3CX PBX. We used this document for ports opening...
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