rtp ports

  1. 3CX SBC - Set DSCP with nftables

    I noticed in the v20 Update 7 release notes that it says, "marked RTP traffic as high priority (TOS 46) ". When I upgraded to v20 about a year ago, I was surprised that the latest SBC software doesn't set industry standard QoS markings. I got to work in nftables to mark packets with correct...

  2. 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...

  3. Audio drops after 10-20 seconds

    My Setup Cloud hosted 3cx on Amazon LightSail Product: Professional Version: 18.0 (update 3) Build 461 Extensions: 10 using ring group and call queue Issue: Audio is dropping in both external and internal ext to ext calls. after checking all settings and logs, i was curious to know about the...

  4. RTP Ports closed over Site-to-Site VPN to Google Cloud

    Hello, I have deployed 3CX from Google Cloud Marketplace, it included a default set of firewall rules, please see screenshot: Furthermore I added two more custom rules: - for icmp from everywhere - for every protokoll from subnets of on prem VPN-Sites As mentioned our on prem network is...

  5. Intermittent One Way Audio

    Hi, Pulling my hair out over this one! Client is experiencing random intermittent drop outs of the callers voice. The caller can hear our client but the client cannot hear the caller. This happens briefly for 2-10 seconds and largely happens when there are multiple calls happening. Client...

  6. SIP provider uses RTP 10000:20000

    The question is how adjust RTP ports to include this range? Using 3CX 15.0.62928.5.
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