I have no experience with SPA504G headset of any kind, but Plantronics HW720-SPA, Jabra BIZ 1500 Duo or Jabra BIZ 2300 Duo has been reported to be working in the past. I'm sure there are other models as well, but I can't enumerate. The Jabra BIZ 2300 QD Duo is a binaural corded headset for desk phone connections. The BIZ 2300 QD Duo makes your conversations better with wideband audio, a noise-canceling microphone, and a 360° swiveling boom arm.
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Jabra Headset Adapter Cable
for Headset - 6.56 ft - 1 x Quick Disconnect Audio - 1 x RJ-10 Phone - Black
Features
For exceptional quality, upright compatibility and reliability use this Phone Cable
With 1 x RJ-10 Phone connector, it is compatible with a headset
Cord to connect a Jabra Quick Disconnect headset to phones with a modular (RJ) interface. Please check the compatibility guide for which cord works with your specific phone.
General Information Manufacturer: GN Netcom A/S Manufacturer Part Number: 8800-01-37 Manufacturer Website Address: http://www.gnnetcom.com Brand Name: Jabra Product Model: 8800-01-37 Product Name: Headset Adapter Cable Product Type: Phone Cable Technical Information Cable Length: 6.56 ft Connector on First End: 1 x Quick Disconnect Audio Connector on Second End: 1 x RJ-10 Phone Device Supported: Headset
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