Hello, I'm confused who is the manufacturer of this. Are the following same:
https://www.amazon.com/gp/product/B01LXFA83I/ref=as_li_qf_sp_asin_il
https://www.amazon.com/POLYCOM-OBI-Accessories-Wireless-AC-1517-49585-001/dp/B07FZQX1RQ/ref=cm_cr_arp_d_product_top
https://www.provantage.com/poly-polycom-1517-49585-001~7POL915U.htm
Last two seems to be same.
Thanks,