SIP Express Router: Free GPL-ed SIP server (registrar, proxy, redirect)
http://iptel.org/ser/features
De-facto standard
SER: domains, subscribers
Routing language
extension modules
http://iptel.org/download

INVITE: initiates sessions
ACK
CANCEL
BYE
REGISTER
OPTIONS
SIP extension methods:
SUBSCRIBE/NOTIFY/MESSAGE: instant messaging
REFER: call transfer
PRACK: provisional reliable responses
INFO
UPDATE

SIP Phones (User-Agents)
SIP Servers (Registratar, Proxy, Redirect)
SIP PSTN Gateways
Application Servers (Media Servers)

The number of phone lines is determined by your computer’s PCI slot.
Voicent software can support unlimited phone lines. The restriction is
limited PCI slots on each computer. For large group of phone lines, you
need to consider using mulitple computers with networking. This is
our enterprise edition od BroadcastByPhone.
For your integration, you can check out more developer’s information
at […]

In order to test the product properly, you must have a campatible
voice modem that works with the software. If you can not find on at your
place, you may order one at http://www.voicent.com/store.
We ship voice modem internationally.
>
> Hi We are interested in your Broadcast by Phone as our messaging system for. But I have downloaded […]

Please see deatiled product demo, product brochure
and pricing, feature listing is at
http://voicent.com/appointment-reminder-phone.php
> I would like pricing and capacity information regarding your voice reminder
> package. Interested in using this system to remind customers of past due
> utility bills.
>
>

1. Yes, only professional/enterprise version has interactive feature.
2. Yes, you can upgrade. It is $299 to upgrade later. Upgrade
can be purchased any time at http://voicent.com/store/autodialer_upgrade.php
>
> Two Questions:
> 1. with the standard edition, can a person answering the phone use their
> phone keypad to confirm an appointment and other \’interactive\’ numbers?
> Your […]

Voicent AutoRemdiner Enterprise version will meet your requirement. You
can setup AutoReminder system on one computer and all three office can
access to the appointment information.
You can look at the product information, feature comparison, online
demo and pricing at http://voicent.com/appointment-reminder-phone.php
Also feel free to download and test the software before you buy
at http://www.voicent.com/download. There is no expiration date
on trial.
> […]

Voicent BroadcastByPhone professional version can do what you need.
The computer can dial a list of phone numbers and hang up once answered.
This is archived by provide an empty .wav file (no recording). The
call status is displyed next to the phone number after the call is made.
Feel free to download and try the program before you […]

We have customers using Vonage.
With Voicent software, you can set call interval so the dialer will not
continuously using the phone line. This seems to satify some phone
company’s unlimited calling plan.
> I am doing the research and set up for a friend in the home loan business. We
> are intent on trying your dialer software and […]