Load Test Results Tell the Story
By reducing the load on the server’s CPU, the number of simultaneous calls that are supported on the telephony system is increased significantly. The echo tail size of the hardware echo cancellation module has been set to 128 taps, and load tests show that the same number of simultaneous calls are achieved as when the software echo cancellation is disabled completely.
Ordering the Hardware Echo Cancellation Option
Each separate Astribank or Xorcom IP-PBX** requires a single Echo Canceller card. The hardware echo canceller option includes 32 voice channels and support for up to a total of 144 channels. All ports/channels in the chassis need to be licensed for the module to function. Additional channels are licensed in bundles based on the telephony interface type:
Hardware Echo Cancellation Limitations and Configuration Tips
Before you configure a system that includes the Xorcom hardware-based echo cancellation (HWEC) module you should be aware of a few design limitations:
- HWEC is not supported in the C/XR1000 or CXS1000 models.
- For certain telephony module combinations not all port types will be able to use the HWEC.
* Except for the low-end C/XR1000 and CXS1000 “Spark”, which do not support the hardware echo cancellation module.
** The echo cancellation hardware is an integral part of the Astribank devices with 6 or more PRI ports and does not need to be ordered separately.