EHS36 & Jabra GN9330e cause full echo for other party

[Clevelander]

It was happening with all my Jabra GN9330e wireless headsets. I eventually stumbled upon some information indicating the headsets could support multiple hookswitch modes. I had trouble changing that setting though, so I called Jabra.

Jabra informed me that they added the hookswitch settings in August of 2009. Some of my headsets were manufactured before that, some after that. Also, my pre-August-2009 headsets somehow got paired with my post-August-2009 bases, so they were doing odd things when I tried to program that feature. Once we came to that realization AND we paired the headsets to their original bases, we were able to make some progress. To find the manufacturer date of your headset and base, you have to look at the serial number behind the battery on the headset and behind the vertical headset-holder piece on the base. The 3rd and 4th to the last position are the manufacturing month and year. For example, ABCDEFGHIJM79DD would indicate it was manufactured in July (indicated by the 7) of 2009 (indicated by the 9).

POST-AUGUST-2009 HEADSETS & BASES
Once everything was married up properly, we changed the hookswitch settings on the post-August-2009 headsets/bases to be "DHSG" mode (by default, they were set to "GN RHL") ("DHSG" is what is used by Siemens, Elmeg, Cisco, Avaya, and Polycom desk telephones). THEN, I could use the headsets without hearing the echo. Once I put the headset in "DHSG" mode though, the headset was effectively useless without the EHS36 being used (no audio in either direction).

PRE-AUGUST-2009 HEADSETS & BASES
When I got the pre-August-2009 headsets & bases married up properly (these are the ones that don't let me change the hookswitch mode), I found that I could use them with my T46G and T42G phones by plugging the headset base directly into the phone WITHOUT using the EHS36. There was no echo on these. I wasn't able to answer a call by pressing the button on the headset, but I could leave the headset "off hook", press the headset button on the phone to activate headset support, and use the softkey buttons on the phone to control the call (pick up, mute, and hang up). When I added an EHS36 into the mix on these headsets, it did not change any behavior -- that is, it added no functionality, and I was still unable to pick up the call using the button on the headset.

I'm a little disappointed that the EHS36 was unable deliver full functionality to the pre-August-2009 headsets, especially considering they're from one of the larger headset companies (Jabra).