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IP Telephony

DTC100
Sample: 79US$
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DTC200
Sample: 89US$
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DTC300
Sample: 89US$
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DTC400
Sample: 99US$
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DTC500
Sample: 109US$
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DTC Office
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DTC GW
Different Models available
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VoIP DTC Softphone (SIPPS compatible)


A software based VoIP phone with full funtionality for Computer-Telephony integration or as convenient and cost saving application on your laptop when travelling.


DTC_Softphone Status: available
Lead time: 1-2 weeks
Sample: 43US$
Volume Price: ask


Free local shipment (Singapore only)
Please request quotation.



DTC Softphone features

DTC Softphone offers all functions that make online-communication comfortable and efficient. It offers a range of telephone related features, an address book and contact management, Instant Messaging and video calling capability.


1 Telephone features
1.1 Scenarios for the use of DTC Softphone
- Calls from PC to PSTN (and vice versa)
DTC Softphone can be used to make calls into the public telephone network via SIP-gateways. DTC Softphone is interoperable with all major SIP gateway manufacturers. It guarantees reliable sound quality by supporting standard codecs for every bandwidth (see section 3, “supported codecs”).
- Calls from PC-to-PC (or to other SIP-devices)
DTC Softphone supports on-net calls with other SIP devices. For these calls, only the regular online fees occur. Peer to Peer calls are possible, as well as server-connected calls.

1.2 DTC Softphone Telephone Features
- 2 lines for telephone calls
- Conference calls with up to three participants
- Accept calls
- Reject calls
- Check-back
- Put line on hold
- Call forwarding
- Redirect calls
- 10 quick dial keys
- Call history (received, made, missed calls)
- Redialling
- Automatic redialling
- Call-number display (optional)
- MultiFrequency Dial tones (DTMF transmission in-band, out of band)
- Optional encryption of the audio stream when talking with another DTC Softphone-user
- Dial with the Dialpad on the interface, with the keyboard or with a USB Handset (list of supported phones available on request)

1.3 Answering machine
DTC Softphone contains an answering machine that features remote inquiry and can record ongoing calls. It includes the following features:
- Record on-going phone calls / conversations
- Define different answering machine modes (answering machine accepts call instantly / after X seconds /…) with different announcements
- Define the maximum recording duration, disable recording function
- Play recordings during another conversation to your counterpart

1.4 Push to Talk
Push to talk, works as an internal phone for DTC Softphone clients. This function is especially important in business environments, law firms and doctor’s practices. If a predefined key is pressed, a connection is automatically established to a predefined counterpart. The counterpart’s DTC Softphone is set to accept “Push to talk” calls from this source instantly and plays the call over the speakers.

1.5 Room Surveillance
In room surveillance mode, DTC Softphone will make a call to any specified phone number when a certain noise level is exceeded. Currently, an audio connection will be established, in future versions, a video stream will be added.

1.6 Multiple Registrations
With DTC Softphone, you can register at any number of registrar servers, gateways, proxy servers etc. This is important for users who would like to use one service for the termination in the PSTN, and another one for peerto- peer calls over the internet.

1.7 Personal Settings
DTC Softphone users have a variety of options for customizing DTC Softphone to their individual needs and preferences:
- Choice between different skins (user interfaces)
- Dial number suppression on / off
- Customize ring tones / knock tones
- Customize on-hold music


2 Address Book and Buddy List
2.1 The DTC Softphone address book
The DTC Softphone address book fulfils several functions:
- Contact Pool. All of the user's contacts can be saved in this address book.
- Communication Center Make contact with a single click, either to call them, or to send them an instant message (see part 3, Instant Messaging)
- Call Filter, Voice over IP SPAM filter. Define different behaviours for DTC Softphone. With a few clicks, the user can define whose calls to accept, whose calls to redirect to other numbers and whose calls to direct to an answering machine with an appropriate answer message.
- History of the last calls made, missed and received

2.2 Buddy List
The Buddy List is a mini address book: all buddies are listed; it is possible to initiate calls and chats from the buddy list, and control all major settings of DTC Softphone. The buddy list is skinnable.

2.3 Outlook synchronization
Contacts in the address book can be synchronized with Outlook contacts. Contact lists of Outlook, Outlook Express and Outlook Exchange servers are supported.


3 Instant Messaging
DTC Softphone is a platform for several instant messaging services. Currently supported instant messaging services include:
- MSN Messenger
- ICQ
- AIM
- Jabber

3.1 IM Conferences between different services
DTC Softphone closes the gap that normally exists between instant messaging services. With DTC Softphone, conferences between different Instant Messaging services are possible. For the first time, users of AIM, MSN Messenger, ICQ and Jabber can be united in one Instant Messaging Conference!

3.2 A new approach to multiple service instant messaging
Contrary to the customary approach to instant messaging platforms that support multiple services, DTC Softphone does not focus on the different services. Instead, DTC Softphone displays all online states and functions on the contact level instead of the service level.
Example:
Normally, instant messaging clients that support more than one service, display the online status of each contact independently. So, a contact that is “online” at MSN Messenger, but “away” at ICQ, would be displayed in both buddy lists and both with an “online” and “away” status. DTC Softphone on the other hand only shows the contact once, and with the most positive online status.(“online” being more positive than “away”). So DTC Softphone users can see at a glance whether or not a contact is reachable, without bothering about which service the contact uses.

3.3 Individual Instant Messaging Auto Replies
DTC Softphone allows the user to set Auto Replies. An Auto Reply is an automated answer to an incoming instant message. In the auto reply a user can inform the person trying to contact him when he will be back in the office, or what would be a good way to contact him. With DTC Softphone, the user can set individual Auto Replies for each contact, for a group of contacts, or for all contacts as a global setting. The Auto Replies can also be scheduled, so that at certain times / days certain auto replies are in effect, without the user having to bother switching them.

3.4 Individual sound settings
Individual sounds can be assigned to individual contacts or contact groups.


4 Video telephony
DTC Softphone offers high-quality video telephony. The video codec is H.263; H.264 is scheduled for Q4/2005.


5 TAPI interface
All Outlook contacts and contacts of other address books and programs supporting TAPI can be directly dialled. Simply click on a contact and DTC Softphone automatically dials that contacts phone number. If you receive a call the details of the calling person could pop up automatically.


6 TFTP Configuration
A centralized configuration via TFTP server makes it easy to install and update several clients.


7 Feature manager
It is possible to customize the features for every DTC Softphone client to your needs. Individual groups with different features can be defined.


Technical Issues & additional features
SIP-compliance
DTC Softphone is compliant to the Session Initiation Protocol, an RFC by the Internet Engineering Task Force (IETF). The SIP protocol is an open standard; DTC Softphone can communicate with any other device that is based on SIP (telephones, gateways, proxies etc.)

Supported Codecs
- PCM A
- PCM U (G-711)
- G726-32
- G726-24
- GSM
- ILBC
- G729A (on request)
- G.723 (on request)

RTCP / Bandwidth monitoring
Sound quality is maintained by a technology that constantly monitors packet loss and jitter during calls. If jitter or packet loss exceeds a tolerable amount, the rate of compression is increased by selecting another codec. This ensures top sound quality throughout each call.

Automatic Gain Control
Automatic gain control manages the gain level of the microphone, avoiding overdrive and too low speech.

DTMF
Dial tones (DTMF) are transmitted inband. Also, dial tones are transmitted out of band (RFC 2833).

Support for two soundcards
If two soundcards are installed on the computer (for example one internal soundcard and a USB sound device (headset etc.)), one soundcard can be used for signalling the ring tones over the speakers, listening to music etc., while the other one is used for communication.

SIP Stack / Supported RFCs
DTC Softphone uses our own SIP stack; this gives us full control over enhancements and the implementation of new RFCs and protocol extensions.
- RFC 3261 (SIP)
- RFC 3262 (PRACK)
- RFC 3264 (Offer/Answer Model)
- RFC 2327 (SDP)
- RFC 2617 (Digest Authentication)
- RFC 2782 (DNS SRV)
- RFC 3265 (Subscribe/Notify)
- Draft IETF SIP Referred By -05
- RFC 2833 (Out of band DTMF)
- RFC 2976 (Info Out of band DTMF)
- Image adjustment (brightness, contrast, saturation, luma, chroma)
- Interlaced and Progressive Sources
- Different MPEG-4 post-processing levels for optimal visual quality (manual and auto-adjustment)
- Customizable on-screen display

For details please contact us for an assessment & offer.

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