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If anyone is using Grandstream GXP phones, I'd highly recommend that you upgrade to v1.1.6.16 of the firmware. This firmware combined with the recent update to 3CX server (build 4393) makes for a very stable platform. Line appearance, extension appearance, BLF, and other presence buttons work flawlessly now.
Also, DMTF generation problems have been eliminated in this firmware upgrade.
Also, DMTF generation problems have been eliminated in this firmware upgrade.