TD-LTE Router In-Depth Comparison: AirMaster 3100V vs GreenPacket DT-350

Evaluating indoor TD-LTE desktop modems for Band 42 (3500 MHz) deployments requires comparing RF sensitivity, throughput stability under weak signal conditions, and hardware VoIP capabilities. Here is an empirical comparison between the AirMaster 3100V and the GreenPacket DT-350.

Tested Models: AirMaster 3100V (Firmware V2.0.0B31) • GreenPacket DT-350 (Unlocked Band 42 SIMs)

Key Findings and Benchmark Summary

Feature	AirMaster 3100V	GreenPacket DT-350
VoIP Hardware	No FXS RJ-11 port	Built-in SIP client & RJ-11 port
Wi-Fi Performance	802.11n 300Mbps	802.11n 300Mbps
Weak Signal Stability	Superior antenna gain (RSRP stability)	Moderate gain; benefits from external SMA antennas
Firmware Flexibility	Clean web management	Requires unlocking for full VoIP/APN menus

Recommendation: If telephone VoIP handset integration is required, the GreenPacket DT-350 is the clear choice. For raw RF reception in fringe coverage areas, the AirMaster 3100V delivers more consistent speeds.

How to Configure VoIP SIP Settings on GreenPacket DT-350 4G Routers

The GreenPacket DT-350 TD-LTE indoor router includes an integrated hardware VoIP FXS port (RJ-11) for connecting analog telephone handsets directly to SIP servers (such as Asterisk, FreePBX, or telecom IMS gateways). However, on many telecom-branded firmwares (such as Irancell), the VoIP menu is hidden from standard administrative accounts.

Hardware: GreenPacket DT-350 TD-LTE Router • RJ-11 POTS Handset • SIP Protocol

1. Accessing Hidden VoIP Menus

Log in with the root/operator credentials (or inspect the web GUI source to reveal hidden navigation items under /voip_settings.html or /sip.html).

2. SIP Account Configuration

SIP Proxy / Registrar: YOUR.PBX.SERVER.IP
Port: 5060
SIP Transport: UDP
Outbound Proxy: (Optional, set if behind telecom NAT)
Account / Display Name: 101
Authentication Username: 101
Secret / Password: YOUR_SIP_SECRET
Codec Priority: G.711u (PCMU), G.711a (PCMA), G.729

Save and apply settings. Once registered, the Phone LED on the router faceplate illuminates solid green, and connected analog handsets will receive dial tone.