Aastra Telecom 57I CT, 55I, 53I manual SIP Asserted Identity for Sylantro Servers

IP Phone Administrator Guide Advanced Operational Features

Advanced Operational Features

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->GlobalSIP->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.

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.

When an IP phone receives an incoming call, the IP phone does the following actions:

•Checks to see if the incoming call is from a registered proxy server.

•If the call is forwarded via a registered proxy server, then the message has already been verified and authenticated by the server. The caller is part of the Trust Network. The IP phone UI displays the caller information contained in the PAI header.

•If the call is not forwarded via a registered proxy server - and therefore is not a “Trusted Entity” - the IP phone UI does not display any trust information contained in the PAI header.

6-22 41-001160-00, Release 2.1, Rev 04