Min And Max Registration Time; Default Q; Reject Registrations Across Nat - Snom 4S Administrator's Manual

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Min and Max registration time

User agents register for a specific amount of time. If a user
agent does not refresh a registration before this time, the registration is
silently discarded. The registration time may be limited to a minimum and
maximum time.
Limiting the minimum registration time avoids too many
refreshes which cause network overhead. Limiting the maximum registry
time reduces the danger of a user agent being unreachable for a longer
period of time.
Typical values for minimum and maximum times are 30 seconds
and 7200 seconds (two hours).

Default Q

When a user agent registers with the proxy, it should indicate
the probability with which the contact can be found at this address.
This value control the sequence in which the proxy searches for a user
(see sequential forking) For instance a mailbox would register with the
proxy with a low probability; a softphone would reregister with a lower
probability value when the screen saver goes on.
In this field you can define which value should be taken if no such
value has been specified. The value must be in the range between 0.0 and
1.0. A good value is 0.5 or 1.0.

Reject Registrations Across NAT

When a user agent registers, it provides a contact and a path that
tell the registrar how the user agent can be reached. If the packet goes
through NAT-aware equipment, the proxy will get not only the private
address but also the way to get there.
When a user agent from a private address registers without
a path at a public address, the registration will fail. Unfortunately, the
registration is shown in the list of registered users, but the registration
response never made it back to the user agent. This annoying effect can
be avoided by turning the flag on. The proxy will then not accept private
IP address registrations if they have a public address and if there is no
path provided with the registration. Instead it will write a log entry.
68 • Registration
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