Encore can provide the following speech coders and telephony products

• G.723.1

• G.729A/B

• G.726

• G.711

• G.728

• GSM

• GSM-AMR

• G.165/G.168

• DTMF

• Caller-ID

Encore’s speech and telephony products support Texas Instruments’ TMS320C5000 and C6000 series of DSPs and Infineon’s Carmel DSP. Apart from being available on these DSPs Encore can also port these standards to customers specific DSPs or processors.

• Testing with the respective standard test vectors and verifying for bit exactness.

• We do listening tests on all speech coders for various input speech samples.

• For waveform coders (for e.g., G.726) we measure signal to noise ratio (SNR) for different signals.

Both G.165 and G.168 are line or network echo cancellers. The difference is that G.168 validation tests involve more stringent requirements compared to G.165. G.168 echo canceller is supposed to be superior to G.165, still they can interoperate. (Our package contains G.168 which can be used for G.165 also).

Currently not. (It is fixed for 32 msec). But we are working on configurable tail length code. (Tail length must be powers of 2, like 4, 8, 16, 32, 64, 128 msec etc.)

Encore develops the following protocol stacks:

• H.323

• Sessions Initiation Protocol (SIP)

• Media Gateway Control Protocol (MGCP)

• Megaco

These protocols are available on the PC platform right now.

Yes, Encore can port the VoIP protocols to the customers target RTOS or platform.

There has been no third party qualification of Encore’s protocol stacks but our protocol development team participates in all the interoperability shows called the ‘Bake-offs’ that take place all over the world frequently. Our products have been quite successful at these shows.