• C/C++ language support
• H.100 (CT Bus) switching support
• Support for Super-Channels and Sub-Channels
• Tone detection and generation
• Support for ring tone, busy tone and Caller ID
• BER Testing
• File recording and playback
• CAS signaling and Robbed bit signaling
• HDLC generators and receivers
• Silence detection
• Audio Mixing
• Trunk Interface (onhook/offhook)
• DSP SDK available for Texas Instruments C54x and C55x DSPs
• Dynamic link libraries (DLL)
• ISDN Call Control (Provided as an add-on)
• Demonstration programs with source code.
• Support for multiple operating systems.
• C# demo programs provided

OTX supports the following cards:

• Thor-2-ExpressCard: Express Card based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCI: PCI based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCI-Plus: PCI based Dual Span T1/E1/J1/ISDN PRI interfaces with 32-bit data DMA feature.
• Thor-2-PCI-Express: PCIe based Dual Span T1/E1/J1/ISDN PRI interfaces with 32-bit data DMA feature.
• Thor-4-ExpressCard: Express Card based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-4-PCI-Plus: PCI based four Span T1/E1/J1/ISDN PRI interfaces with 32-bit data DMA feature.
• Thor-8-PCI: PCI based eight Span T1/E1/J1/ISDN PRI interfaces.
• Thor-8-PCI-Plus: PCI based eight Span T1/E1/J1/ISDN PRI interfaces with 32-bit data DMA feature.
• Thor-8-PCI-Plus-2.0: PCI based eight Span T1/E1/J1/ISDN PRI interfaces with 32-bit data DMA feature.
• Thor-2-PCMCIA: PCMCIA based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCMCIA-Plus: PCMCIA based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCMCIA-PRO: PCMCIA based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCMCIA-EX: PCMCIA based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Thor-2-PCMCIA-CST: PCMCIA based Dual Span T1/E1/J1/ISDN PRI interfaces.
• Sleipnir-1-PCI-Plus: PCI based single Span T1/E1/J1/ISDN PRI interface with 32-bit data DMA feature.
• Gimle-16-PCI-Plus: PCI based 16 T1/E1/J1/ISDN PRI receive interfaces with 32-bit data DMA feature.
• Arni-16-PCI: PCI based 16 FXO interfaces.
• Vidar-5x16-PCI: PCI based DSP card with 16 Texas instruments TMS320C548 DSPs.