VoIP Phones - Grandstream HT8xx: Difference between revisions
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Some customers have had problems with one-way audio or only being able to make outbound calls and inbound fail. This would be related to NAT breaking things. Some settings in the SIP settings area may help, eg:
* NAT Traversal: Keep-Alive (or try stun, with stun.aa.net.uk)
* Register Expiration = 10 (this should be MINUTES)
* Register expiration = 300 (this should be SECONDS, ie 5 minutes)
These will make the device register more often (every 5 minutes) and send some keep-alive packets to keep NATed session open through your router.
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