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Grandstream GXP1615
| Type | Entry-level IP Phone (VoIP desk phone) |
| SIP Accounts | 1 SIP account (supports up to 2 call appearances) |
| Lines | 2 line keys |
| Display | 2.95" LCD (132 × 48 pixels), backlit |
| Audio | HD audio with full-duplex speakerphone |
| Conferencing | 3-way audio conferencing |
| Power | Supports PoE (IEEE 802.3af) | Optional external power adapter |
| Headset Support | RJ9 headset port + EHS support (Plantronics wireless headsets) |
| Provisioning | TR-069, XML config files, Zero Config (with Grandstream UCM) |
| Security | TLS, SRTP, HTTPS encryption |