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Usually there will be two types of calling scenario, as illustrated below:
Calling via SIP Servers
First, the Vigor V models of yours will have to register to a SIP Registrar by sending
registration messages to validate. Then, both parties' SIP proxies will forward the sequence of
messages to caller to establish the session.
If you both register to the same SIP Registrar, then it will be illustrated as below:
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.
Peer-to-Peer
Before calling, you have to know your friend's IP Address. The Vigor VoIP Routers will build
connection between each other.
Our 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.
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Vigor1000 Series User's Guide
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