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Network configuration

IP Addresses

If your network is protected by firewall which restrict outbound traffic please ensure you allow the following addresses and ports combinations:

North and South America, Asia and Oceania:

  • Ports TCP/UDP 5060, 5566 (SIP Signaling): 69.164.221.134 amn.st.ssl7.net
  • Ports UDP 10000-65000 (RTP Audio): 23.105.180.124, 23.105.180.131

Europe and Africa:

  • Ports TCP/UDP 5060, 5566 (SIP Signaling): 109.233.115.107 eu.st.ssl7.net
  • Ports UDP 10000-65000 (RTP Audio): 134.19.166.164, 134.19.166.167

Note: although normally your SIP endpoints will be assigned to one of the locations above (based on your geographical location) in unlikely even of one of GoTrunk data centres becoming unavailable your traffic will be redirected to the other location (via automated SIP fail over mechanism). It is therefore important to allow traffic to all above listed IP addresses.

NAT handling and SIP ALG

Ideally your PBX server should be allocated behind static IP and SIP port combination. But our SIP Proxy also supports NAT handling, so you can use private LAN IP address / port in SIP messages.

The only requirement is you would need to use local LAN IP address / port in your SIP Signalling, so if your PBX is for example at 192.168.5.10, the Contact header should be:

Contact: sip:442031234567@192.168.5.10:5060

When our SIP Proxy detects local LAN IP in SIP headers, it will automatically re-write it to the public IP:PORT from where the traffic was received, thus routing ACK correctly back to your PBX.

SIP ALG (Application Layer Gateway) is common feature in many commercial routers.
Many routers have this SIP ALG turned on by default.
This should be disabled as may induce following issues:

  • Lack of incoming calls
  • One way audio issues
  • Break Sip signalling