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I would like to open a discussion about the Enhanced Speakerphone feature. How and when it is used? Does this feature apply only to the 4500 series and 8520/8560 sets or will it apply to the new Mitel phones also?

From the manual:

Display phones have a built-in, integrated speakerphone that allows on-hook dialing and handsfree operation on outside calls and intercom calls. The speakerphone can be used in standard mode or in enhanced mode which allows for full-duplex operation over a limited volume range (the range depends on trunk characteristics, typically the range is 1 to 3).

To use an enhanced speakerphone on a digital phone, the user establishes a call and presses SPCL and then the Speaker button. There will be about one second of white noise at this point. (Both parties should avoid speaking during this white noise.) This white noise is used to calibrate the echo-canceling circuitry. After the white noise, there will be a confirmation tone . Then the user will be connected in an enhanced handsfree call. If the speakerphone cannot be calibrated correctly, due to trunk conditions, the enhanced speakerphone will not be enabled and the display will show CANNOT ENABLE ENHANCED MODE.

It is normal for an outside party to hear a minimal amount of his or her own echo when speaking to a digital phone in enhanced speakerphone mode. This is usually acceptable to most callers on local calls and on most long-distance calls. However, on calls established using an IP Networking Module or IPRC and some T1 and long-distance calls involving significant delays (for example, cross-country T1 calls, overseas calls or calls via satellite), the amount of echo may be objectionable and the enhanced speakerphone mode should not be used on these types of long-distance calls, including those connected via an IP Networking Module.

Enhanced speakerphone is available on the HX with the 8528 and 8568 keysets.