I've got some leftover Polycom SPIP 331 phones from an old account we had with a hosted PBX provider. I am having the hardest time getting them to provision with 3CX. I've been using this method: http://www.3cx.com/sip-phones/insert-provision-link-web-interface-polycom/ But I can't seem to get it working. I'm running FW 4.0.7 on 3CX 12. Any thoughts?