CSD 3324 SPV Secure Telephone

CSD 3324 SP Secure Voice, Telephone Encryption

CSD 3324 SPV Secure Voice Telephone Encryption

A secure telephone system, the CSD 3324 SPV encrypts voice conversations over the public switched telephone network. Using the AES 256-bit encryption algorithm and Diffie-Hellman public key exchange-based key management, the CSD 3324 SPV offers proven cryptographic strength and ease of deployment and operation. It is also compatible with TCC's CSD 3324 SP telephone/fax encryption system.


  • Strategic-level security for voice communications
  • Excellent recovered voice quality
  • AES-256 with Diffie-Hellman public key exchange for simplicity, cryptographic strength and ease of use
  • Interoperable with TCC's CSD 3324 SP integrated secure voice and fax system
  • User-friendly menu-based set up
  • 50 stored names and phone numbers; last number redial

Integrated Voice Security

The CSD 3324 SPV secures voice communications over the public switched telephone network. Its 9,600bps MPLP vocoder provides excellent recovered voice quality with automatic fallback to 4,800bps CELP as needed. As a result, secure communications are supported over degraded line conditions.

Secure voice communication mode may be password restricted. Without the password, the CSD 3324 SPV functionality is restricted to its non-secure mode. User-friendly menus, which may also be password protected, provide logical setup of the CSD 3324 SPV's voice processing options.

Cryptographic Strength

The CSD 3324 SPV protects voice calls using Advanced Encryption Standard (AES) encryption engines seeded using Diffie-Hellman public key auto-negotiated 256-bit session keys, and path-independent initialization vectors.

Secure Voice Network Encryption with CSD 3324 SPV

TCC's CSD 3324 SPV secures voice communications over the PSTN with another CSD 3324 SPV or TCC's CSD 3324 SP integrated telephone/fax encryptor. The CSD 3324 SP also attaches to Group 3 fax machines and is interoperable with TCC's CSD 3324 SPF fax encryptor.

Technical Specifications

General Features

Ease of installation
and setup

 Connect power

 Connect phone line

 User-friendly menus allow changing factory-configured settings if required

phone numbers

 50 names and phone numbers

 Redial feature of last number dialed

Display and keypad

 2 lines × 16 characters LCD display

 User-configurable # of Rings

 20 push-button keypad

  • 12 button standard telephone
  • 8 function key buttons

Dimensions & Weight

 Width:   31.3cm (12.3 inches)

 Depth:   Depth: 27.2cm (10.7 inches)

 Height:   10.3cm (4.1 inches)

 Weight:   2.32kg (5.1 pounds) unpacked


Primary AC power

Auxiliary DC power


 100-240 VAC, 50/60 Hz, 9.5 watts (nominal)

 Primary or as backup to AC, 10-30 VDC / 7 watts (nominal)


 Operational Temperature: 0°C to +50°C

 Relative Humidity: 5% to 95% non-condensing


Public Key Exchange


 1,024-bit PKE modulus

 256-bit Session Key

 Two each 128-bit Initialization Vector (IVs)

 Six each man-in-the-middle detection ASCII text characters

AES-256 based
Crypto Engines

 Two each (full duplex)

 256-bit key

 128-bit path-autonomous IV

Security features

 Secure mode access controls via secure-mode password

 Protexted menus access password

Line Side
"Black" Interface

 Telephone line interface — 2-wire, RJ-11 phone line

Customer "Red"
Voice (Handset)

 4-wire handset analog signal port (modular RJ-8)

 Voice coding/decoding (CODECs):

  • 9.6Kbps MPLP
  • 4.8Kbps CELP (fallback)


 Available in black or platinum color


TCC is dedicated to quality products and services. TCC is ISO 9001 certified. ISO 9001, granted to TCC by TUV, is the most stringent standard available for total quality systems in design/development, production, installation and servicing.

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