Digium Cards are developed to work with your Asterisk IP PBX. The Digium TDM800p is an 8 port telephony card from Digium, approved to work with Asterisk.  Digium Cards available through VoIPShop.com.au are all A-ticked and are approved for Australian use.
The TDM800p has a slot for an echo cancellation module that will be available shortly. The Digium TDM800p telephony card has the capacity for 8 ports, a combination of FXO and FXS modules. See the below table as to how the Digium modules can be combined on the Digium TDM800p card with your Asterisk or trixbox or other VoIP server to incorporate PSTN lines and analog devices. To make sure you pick the right card for your requirements see the Digium TDM800p card see the VoIPShop Knowledge Base : Asterisk and Digium Hardware FAQs here

ONLY FXO Modules with TDM800p Card	ONLY FXS Modules with Digium TDM800p Card:
TDM801B - 1 TDM800p Card + 1 FXO (1 X100M) TDM802B - 1 TDM800p Card + 2 FXO (2 X100M) TDM803B - 1 TDM800p Card + 3 FXO (3 X100M) TDM804B - 1 TDM800p Card + 4 FXO (1 X400M) TDM8S4B - 1 TDM800p Card + 4 FXO (4 X100M) TDM805B - 1 TDM800p Card + 5 FXO (1 X400M + 1 X100M) TDM806B - 1 TDM800p Card + 6 FXO (1 X400M + 2 X100M) TDM808B - 1 TDM800p Card + 8 FXO (2 X400M)	TDM810B - 1 TDM800p Card + 1 FXS (1 S110M) TDM820B - 1 TDM800p Card + 2 FXS (2 S110M) TDM830B - 1 TDM800p Card + 3 FXS (3 S110M) TDM840B - 1 TDM800p Card + 4 FXS (1 S400M) TDM84SB - 1 TDM800p Card + 4 FXS (4 S110M) TDM850B - 1 TDM800p Card + 5 FXS (1 S400M + 1 S110M) TDM860B - 1 TDM800p Card + 6 FXS (1 S400M + 2 S110M) TDM880B - 1 TDM800p Card + 8 FXS (2 S400M)
Combination FXO and FXS Modules with Digium TDM800p Card
TDM811B - 1 TDM800p Card +  1 FXS & 1 FXO (1 S110M + 1 X100M) TDM812B - 1 TDM800p Card +  1 FXS & 2 FXO (1 S110M + 2 X100M) TDM813B - 1 TDM800p Card +  1 FXS & 3 FXO (1 S110M + 3 X100M) TDM814B - 1 TDM800p Card + 1 FXS & 4 FXO (1 S110M + 1 X400M) TDM815B - 1 TDM800p Card +  1 FXS & 5 FXO (1 S110M + 1 X400M + 1 X100M) TDM821B - 1 TDM800p Card +  2 FXS & 1 FXO (2 S110M + 1 X100M) TDM822B - 1 TDM800p Card +  2 FXS & 2 FXO (2 S110M + 2 X100M) TDM824B - 1 TDM800p Card +  2 FXS & 4 FXO (2 S110M + 1 X400M) TDM831B - 1 TDM800p Card +  3 FXS & 1 FXO (3 S110M + 1 X100M) TDM841B - 1 TDM800p Card +  4 FXS & 1 FXO (1 S400M + 1 X100M) TDM842B - 1 TDM800p Card +  4 FXS & 2 FXO (1 S400M + 2 X100M) TDM844B - 1 TDM800p Card +  4 FXS & 4 FXO (1 S400M + 1 X400M) TDM851B - 1 TDM800p Card +  5 FXS & 1 FXO (1 S400M + 1 S110M + 1 X100M)