I used FreePBX before our company decided to switch it to something easier (presumably) for 3CX users. However, their website describes that the Grandstream phones are compatible, but so far after initialization the phones have been behaving horribly and have become unstable in use no matter how I change configurations etc. X4U works like a champ! No complaints, no delays, no problems! Highly recommended for 3CX environments.
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