I'll keep this short and to the point. It's been hit or miss with faxing using Cisco SPA112s and Grandstream HT802s. I've configured both as "regular" extensions and fax extensions....... I know the Cisco 112 is not supported, but someone has to have a configuration that is "working." I hate faxing, but one of my clients is dependent on it so here I am. I've had great success using another PBX (almost 100% both ways) with the same SIP provider, but have hit a brick wall here. Any information provided would be greatly appreciated.