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136 TALKSWITCH USER GUIDE • UK & IRELAND
Problem: 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.
For more VoIP information, see Chapter 5: VoIP Information.