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linphone is a SIP software

issue description

After dialling, the line gets established, but no voice from the other side can be heard.


  • several linuxes
  • NAT environment


The other communication partner is sending packets which the local NAT gateway does not send to the system on the LAN, where the SIP call originates from.


  • variant 1: configure a “stun” server. You have to have one available to use, or can run an own stun service.
  • variant 2:
    • configure forwarding for the involved ports. With this, the NAT gateway will forward UDP 5060, 7078, 9078 to your LAN system
    • additionally you have to hint which IP your NAT gw on the internet is using in the linphone preferences, and check “Behind NAT/Firewall”.
software/linphone.txt · Last modified: 2021/03/23 12:22 (external edit)