IP Phone Reference Design: LE IPP
Low-cost Low End IP Phone

The low-cost Low End IP Phone (LE IPP) Reference Design is a complete, fully tested, IP Phone design that enables OEMs to build an IP phone. The LE IPP has been jointly designed and developed by Texas Instruments (TI) and Adaptive Digital Technologies, Inc. (Adaptive Digital). See write up EETimes | DSP Resource

The Adaptive Digital Software provided with the LE IPP is a complete SIP phone application, including call control, protocol stack (SIP, TCP/UDP/IP, RTP, STUN), G.711, G.729AB, acoustic echo control, tone handling, and AGC.

The hardware, based around the TI TNETV2502, includes RAM, Flash Memory, Ethernet Interface, LCD Display, DTMF Keypad and Handset. 


a low cost IP Phone EXAMPLE

Your definition may vary

The LE IPP Difference

The benefits!

Basic IP Phone with simple features

Very low-end without LCD, PoE, speaker, etc.

<$20 in high volume

No PC connected behind it

Optional LCD, PoE, and speaker for group listen

1-channel of G.711 or G.729AB

Conferencing handled in the network

Additional codecs optional

Basic SIP signaling and call control

Supplementary services offered in the network

Typically targeted at low-end enterprise, SMB, or residential markets

Complete, tested, reference desig

Field proven Adaptive Digital Software

Single-processor, DSP-based platform

TI DSP technology

Device shipping in volume today

Offers BOM of < $20-30

Fast time to market

Turn-key software

Broad indemnification coverage by TI

Migration path to future TI low-cost IP Phone solutions

 

 

 

LE IPP

TNETV2502 Software Features - Object code w/ no modification

TI TNETV2502

TNETV2502 Software Verification Board

Leverages TI-provided reference design

Schematics and B.O.M. available

Used to validate software and prototype low-end phone

Includes keypad, enclosure, handset, speaker, LCD

For debug, RS232 and JTAG Interfaces are included as well.

Available for purchase from TI for $1,495

  1. Single voice channel with G.711 and G.729AB codecs

  2. Conferencing handled by the gateway

  3. Additional channels or codecs possible via customization with ADT

  4. RTP packetization with configurable periods of 10, 20, and 30 msec.

  5. Handset support with an Acoustic Echo Suppressor (AES)

  6. Group listen speaker mode with volume control (Not a full duplex speaker phone)

  7. RFC 2833 DTMF relay support

  8. Configurable 100 millisecond jitter buffer.

  9. Tone generation – DTMF or fixed tone for echoing key presses on keypad.

  10. Tone generation

  11. Allows for any configurable sequence of tones to be generated towards the phone or network or both.

  12. Packet loss concealment compliant with G.711 appendix I

  13. Comfort noise generation

  14. Voice Activity Detection

  15. Acoustic gain control.

  16. Support for a single Ethernet interface, 3x4 keypad, hook-switch and other control switches, LEDs, and a 2x24 or similar LCD.

  1. Call control & management

  2. Supports RFC 3261 and 3550 SIP signaling and RTP media stream protocols.

  3. Supports SIP authentication, invite, ring, ack, ok, bye and termination messages. 

  4. Supports all supplementary services implemented in the network / gateway

  5. Supports configurable unique SIP username and password (credentials) in non-volatile memory.

  6. Supports MD5 digest authentication.

  7. Supports SIP user agent interoperability with proxy servers.

  8. outgoing & incoming calls, call waiting, conferencing, call forward and call transfer.

  9. Supports configurable digit map for dialing support.

Networking

  1. Supports DHCP and DNS clients, IPv4/UDP/TCP.

  2. Supports STUN for NAT traversal.

LE IPP SPECIFICATIONS

Software

Hardware

Protocols

SIP

TCP/UDP/IP

RTP

STUN

Signal Processing

G.711 with packet loss concealment and DTX

G.729AB

Acoustic Echo Control

Tone handling

AGC
OEM Phone Configuration Tools

TNETV2502 DSP

AIC26 Codec

256Kx16 SRAM

256Kx16 Flash Memory

1KB Serial EEPROM

10BaseT Ethernet MAC/PHY

4x4 Keypad

2x24 LCD

Enclosure

Handset

Features can be added to this baseline design by adding additional hardware and/or software to increase the level of functionality of the IP phone depending on the market directions and conditions. 

LE IPP - customization by Adaptive Digital engineering team available. Optional feature sampling

  1. Line Echo Canceller (ATA)

  2. Speaker phone

  3. Conferencing

  4. Call transfer

  5. Call hold

  6. Call forward

  7. 3-way calling

Possible future enhancements: 3-way calling, 2 Ethernet Ports, Wideband Speech, SIP Enhancements, Encryption, WIFI, and Video.

Adaptive Digital / TI supply:

Reference design schematics and bill of materials

Software verification boards available for purchase

Software as a mixture of source and object code

TNETV2502 devices with indemnification

Other components such as ‘AIC26 codec, voltage regulators, analog components, and logic, as detailed in the reference design




Adaptive Digital Technologies, Inc.
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