If your Linksys WRT54GP2 has a call status page look at 'Jitter' and 'Packets Lost' during a call.
Heavy Internet usage can cause VoIP to break up. Perhaps your neighbor is pirating your bandwidth, or mayby someone on the wired LAN is using bittorrent. Use WPA/WPA2 encryption with a strong shared key, or turn off the WiFi radio altogether.
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