Advanced Operational Features
41-001160-03, Rev 00, Releaes 2.4
6-27
Configuring Advanced Operational Features
On the IP phones, an Administrator can configure TLS and Persistent TLS on a
global-basis only, using the configuration files or the Aastra Web UI.
SIP Asserted Identity (for Sylantro Servers)
The IP Phones support a private extension to the SIP, Asserted Identity (SAI)
within Trusted Networks (as defined in RFC 3325), inside the User Agent Server
(UA) in the Aastra IP phones.
This feature allows a network of trusted SIP servers to assert the identity of
authenticated users, and verify that phone messages originate from a Trusted
Identity. Upon receiving a message from a caller in the Trust Network, the IP
phone reads the contents of the P-Asserted-Identity (PAI) header field and
displays it on the phone UI. This field contains
a more accurate description of the
caller identity (extension/phone number) than is contained in the SIP message.
Notes:
1.
Persistent TLS requires the
outbound proxy server
and
outbound
proxy port
parameters
be configured in either the configuration files or
the Aastra Web UI (
Advanced Settings->Global SIP->Basic SIP Network
Settings
). There can be only one persistent TLS connection created per
phone. The phone establishes the TLS connection to the configured
outbound proxy.
2.
If you configure the phone to use Persistent TLS, you must also
specify the Trusted Certificate file to use. The Root and Intermediate
Certificates, Local Certificate, and Private Key files are optional.
Note:
The phones support PAI header in the UPDATE message,
according to draft-ietf-sipping-update-pai-00. This feature is always
enabled.
If an UPDATE is received with a PAI header from a trusted source, the
phone updates the display with this information. The phone ignores any
PAI received from untrusted entities
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