Deploying the snom ONE IP Telephone System
130
Over the last few years, providers have developed different methods of representing
these two numbers:
•
RFC 3325 describes a way to represent these two numbers. In most cases, it
makes sense to use the
P-Asserted-Identity
header. In this case, the
From
header in the INVITE represents the display number, while the
P-
Asserted-Identity
header has the network number. A similar represen-
tation can be done with the
P-Preferred-Identity
header. The system
changes only the name of the header from
P-Asserted-Identity
to
P-
Preferred-Identity
. The rest remains the same, as in the first method.
•
No Indication: This method simply discards the display number and uses
only the network number in the
From
header. This method is a fallback when
the provider cannot handle any other method. The disadvantage here is clearly
that any redirection information gets lost.
•
Remote-Party-ID: This method is described in a draft that expired years
ago; however, there is still a lot of equipment outside that is supporting this
method. In this case, the
From
header in the INVITE represents the network
number, while the
P-Asserted-Identity
header is the display number.
•
RFC 3325, but don’t hide: This method should not be used. It has been used
in environments where the fields have gotten mixed up, and it is creating even
more confusion.
•
To strip the first digit from a DID number, you can use the pattern
!1([0-
9]*)!\1!u!100
(default destination would be 100).
Creating Trunks
This procedure shows you how to create trunks.
1. From the domain where the trunk will be used, click the
Trunks
tab.
2. Enter a name for the trunk. You can name the trunk anything you prefer (e.g.,
company name, department, etc.). The name must consist of alphanumeric
characters and may contain spaces.
Summary of Contents for ONE IP
Page 4: ......
Page 19: ...Part I Getting Started...
Page 20: ...Part I Getting Started...
Page 47: ...Part II Administering the System...
Page 48: ...Part II Administering the System...
Page 195: ...Deploying the snom ONE IP Telephone System 526...
Page 223: ......