Draytek Vigor2860 User Manual page 311

The major benefit of this mode is that you don't have to memorize your friend's IP address,
which might change very frequently if it's dynamic. Instead of that, you will only have to
using dial plan or directly dial your friend's account name if you are with the same SIP
Registrar.
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Before calling, you have to know your friend's IP Address. The Vigor VoIP Routers will build
connection between each other.
Vigor V models firstly apply efficient codecs designed to make the best use of available
bandwidth, but Vigor V models also equip with automatic QoS assurance. QoS Assurance
assists to assign high priority to voice traffic via Internet. You will always have the required
inbound and outbound bandwidth that is prioritized exclusively for Voice traffic over Internet
but you just get your data a little slower and it is tolerable for data traffic.
Vigor2860 Series User's Guide
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