Talkswitch 24-CA User Manual page 148

When I call someone or they call me, voice is only heard in
one direction.
•
The cause of this problem is usually a result of a router being
misconfigured with respect to port mappings. Ensure all required VoIP
ports are mapped to your TalkSwitch unit. Also, ensure you use a static
private IP address when connected to your router as this can also affect
port mappings from the firewall/router.
•
Use a router that supports the UPNP.
For more VoIP information, visit our support section at
www.talkswitch.com/support.
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