The TC400B is a bundle of the half-length, low-profile PCI-2.2 compliant TC400P base card and the TC400M voice processing module. The TC400B is designed to handle, in dedicated DSP resources, the complex codec translations for highly compressed audio as would otherwise be processed by Asterisk in software.

Asterisk, in software and with Digium G.729a licensing, is capable of transforming the G.729a codec into other codecs for the purposes of call origination or termination, bridging disparate calls, or VoIP to TDM connectivity. These transformations in software are very expensive, in terms of MIPS, and require a substantial amount of CPU time to accomplish. The TC400B not only relieves the CPU of this duty, freeing it up to handle other tasks or to complete additional call processing; but also provides Asterisk with the capability of bridging G.723.1 compressed audio into other formats, a capability not previously possible

The TC400B decompresses G.729a (8.0kbit) or G.723.1 (5.3kbit) into u-law or a-law; or, compresses u-law or a-law into G.729a (8.0kbit) or G.723.1 (5.3kbit). The TC400B is rated to handle up to 96 bi-directional G.729a transformations or 92 bi-directional G.723.1 transformations. The TC400B does not require additional licensing fees for the use of these codecs nor does it require the registration process associated with Digium's software-based G.729a codec licensing.

I will try to get one of this card to test it's performance.
This card should allow us to run more concurrent calls SIP to PSTN calls. This especially important in larger projects with many hundred users.

The card is prices at USD 1600.00

Digium launched a 8-port analog telephony interface card.

The launch of the TDM800P card (based on VoiceBus technology) and a Carrier Grade, Software-based Echo Canceller.

Based on Digium’s patent-pending VoiceBus technology, the TDM800P is a half-length, full-height 32-bit 33MHz PCI 2.2-compliant, 8 port modular analog telephony interface card.

The VoiceBus technology, as first introduced on Digium’s TDM2400P, allows the TDM800P to use an industry standard bus-mastering PCI interface, as found in millions of PCs worldwide, to maximize system compatibility and eliminate system conflicts.

Alongside this card, they’ve also introduced their first software-based echo canceller, the High Performance Echo Canceller (HPEC). The HPEC is carrier-grade and provides host-based Toll-Quality echo cancellation on a global scale. The HPEC solution uses an algorithm that is compliant with the industry standard for echo cancellers, G.168.

The cost will be arround: USD 755.00

Cheers
Daniel