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1.1.4.1. Basic Services
1.1.4.1.1. Making Calls to PSTN and IP Endpoints
This is the most basic service. When the user picks up the handset, the PHONE ADAPTER provides
dial tone and is ready to collect dialing information via DTMF digits from a touch tone telephone.
While it is possible to support overlapped dialing within the context of SIP, the PHONE ADAPTER
collects a complete phone number and sends the full number in a SIP INVITE message to the proxy
server for further call processing. In order to minimize dialing delay, the PHONE ADAPTER maintains
a dial plan and matches it against the cumulative number entered by the user. The PHONE
ADAPTER also detects invalid phone numbers not compatible with the dial plan and alerts the user
via a configurable tone (reorder) or announcement.
1.1.4.1.2. Receiving Calls from PSTN and IP Endpoints
The PHONE ADAPTER can receive calls from the PSTN or other IP Telephony subscribers. Each
subscriber is assigned an E.164 phone number so that they may be reached from wired or wireless
callers on the PSTN. The PHONE ADAPTER supplies ring voltage to the attached telephone set to
alert the user of incoming calls.
1.1.4.2. Enhanced Services
Enhanced Services are provided in addition to Basic calling services and accessed by way of a
touchtone phone through a series of menus. Since the service enabled by the PHONE ADAPTER
are Internet in nature, these enhanced services can be made better by offering users a web browser
based interface to control certain aspects of some or all services.
1.1.4.2.1. Caller ID
In between ringing bursts, the PHONE ADAPTER can generate a Caller ID signal to the attached
phone when the phone is on-hook.
Calling Line Identification Presentation (CLIP)
Some subscribers will elect to always block their Caller ID information, yet there may be a
circumstance where sending Caller ID information for a particular call is desired, i.e. trying to reach a
party that does not accept Caller ID blocked calls.
The subscriber activates this service to send his Caller ID when making an outgoing call. To activate
the service, the subscriber enters the corresponding * or # code prior to making the call. This service
is in effect only for the duration of the current call.
Calling Line Identification Restriction (CLIR) – Caller ID Blocking
The subscriber activates this service to hide his Caller ID when making an outgoing call. To activate
the service, the subscriber enters the corresponding * or # code prior to making the call. This service
is in effect only for the duration of the current call.
1.1.4.2.2. Call Waiting
The subscriber can accept a call from a 3rd party while engaging in an active call. The PHONE
ADAPTER shall alert the subscriber for the 2nd incoming call by playing a call waiting tone.
Disable or Cancel Call Waiting
By setting the corresponding configuration parameter on the PHONE ADAPTER, the PHONE
ADAPTER supports disabling of call waiting permanently or on a per call basis.
Call-Waiting with Caller ID
In between call waiting tone bursts, the PHONE ADAPTER can generate a Caller-ID signal to the
attached phone when it is off hook.
© 2004 Linksys Proprietary (See Copyright Notice on Page 2)
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