Enum - Snom 4S Administrator's Manual

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S N O M
To set up redundancy, you need to enter the address of the other
proxies. Typically this will be IP addresses, however it can also be DNS
addresses. However, you should be cautious that the address cannot be
resolved by DNS SRV because the proxy will try to do so.
The replication retry time is the time that the proxy retries to find
a proxy after a service breakdown of the proxy. Five minutes is a good
time.
For making the exchange of registration information more secure,
you can enter a username and a password. This will be used by the proxy
for challenging incoming replication requests. However, the information
itself is transported unsecure.
It is important that you keep the same setup information on all
proxies that replicate registration information. Otherwise you will have
strange effects depending on the destination where the request was send
by the user agent. Future releases will address the automatic replication
of setup information.

ENUM

ENUM is a machanism built on top of DNS. ENUM bridges the old
telephone numbering system with the new features offered by Internet
applications like SIP. It used the DNS SRV and DNS NAPTR (RFC2915)
features.
What enum does is in principle easy. It converts a telephone
number like +4930398330 into an URL like sip:0.3.3.8.9.3.0.3.9.4.enum.
arpa. This URL is then used to start the call. You can set the ENUM domain
in the routing part of the proxy.
Typically, there will be a DNS NAPTR entry available for this
domain. The proxy will use this entry to resolve the final service and
address that the ENUM record redirects that number to.
90 • DNS
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