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sends the full number in a SIP INVITE message to the proxy server for further call processing. In
order to minimize dialing delay, the SPA maintains a dial plan and matches it against the cumulative
number entered by the user. The SPA also detects invalid phone numbers not compatible with the
dial plan and alerts the user via a configurable tone (reorder) or announcement.
1.3.5.1.2.
Receiving Calls from PSTN and IP Endpoints
The SPA 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 SPA supplies ring voltage to the attached telephone set to alert the user of incoming calls.
1.3.5.2. 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 SPA 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.
1.3.5.2.1. Caller
ID
In between ringing bursts, the SPA can generate a Caller ID signal to the attached phone when the
phone is on-hook.
1.3.5.2.1.1. 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.
1.3.5.2.1.2. 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.
1.3.5.2.2. Call
Waiting
The subscriber can accept a call from a 3rd party while engaging in an active call. The SPA shall alert
the subscriber for the 2nd incoming call by playing a call waiting tone.
1.3.5.2.2.1. Disable or Cancel Call Waiting
By setting the corresponding configuration parameter on the SPA, the SPA supports disabling of call
waiting permanently or on a per call basis.
1.3.5.2.2.2. Call-Waiting with Caller ID
In between call waiting tone bursts, the SPA can generate a Caller-ID signal to the attached phone
when it is off hook.
1.3.5.2.3. Voice
1.3.5.2.3.1. Message Waiting Indication
Service Providers may provide voice mail service to their subscribers. When voice mail is available
for a subscriber, a notification message will be sent from the Voice Mail server to the SPA. The SPA
indicates that a message is waiting by, playing stuttered dial tone (or other configurable tone) when
the user picks up the handset.
1.3.5.2.3.2. Checking Voice Mail
