Draytek Vigor2100 - Manual (Page 24)

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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. Please refer to the Example 1 and 2 in
the 4.3 Calling Scenario.
2.Peer-to-Peer
Before calling, you have to know your friend’s IP Address. The Vigor VoIP
Routers will build connection between each other. Please refer to the Example 3
in the 4.3 Calling Scenario.
The menu tree of the VoIP configuration:
VoIP >> DialPlan
SIP Related Function
CODEC / RTP / DTMF
Voice Call Status
QoS