Neotel SIP Trunk and Com.X Devices

When connecting a Farsouth PBX to a Neotel SIP trunk, we recommend creating a static ARP route to the Neotel session border controller for the best call quality.

If no ARP entry exists for the Neotel session border controller, various call issues may arise, such as poor audio quality, call drops, and missing audio packets during a call.

You can create an ARP route that persists by editing the /etc/network/interfaces file, and adding a post-up command to configuration of the interface that connects to the Neotel session border controller.

The post up line will have the format:

post-up arp -s <ip-of-SBC> <MAC-address-of-SBC>

This is shown in the image below:

This entry, will add an arp route, linking the device with MAC address aa:bb:cc:dd:ee:ff with the IP address 192.168.0.211.

This ARP entry will be added every time the eth0 port is brought up.