MT502 PSTN Spider

By October 22, 2016 November 3rd, 2020 No Comments

PSTN Spider (MT502)


The MT502 – PSTN Spider is a table-top beamforming conference speakerphone. It supports both USB connectivity as well as PSTN telephony making it ideal for audio and video conferencing spaces. The PSTN Spider can also be daisy-chained with Smart Spiders allowing it to cover any room.


Fantastic high-quality speaker phone that bridges analog PBX and USB-based video conferencing.

Mark C.Amazon Reviewer

Audio quality is excellent even when the speaker was 10-12 feet from the base unit. Sound quality in the room has been excellent as well over both analog calls in Zoom video meetings.

Mark D. CarlsonAmazon Reviewer

Daisy Chaining

The ability to connect multiple units together to work as a single system. This enables larger coverage and scalability.

Power Daisy Chaining

The ability to connect multiple units together to work as a single system with one power source. This enables larger coverage and scalability.

Dual Connectivity

Offering multiple interfaces in a single product. This feature allows the use of one product in a room that requires multiple connectivity options (audio and video conferencing).


The ability to connect two calls from different interfaces simultaneously, making your video conferencing participants able to speak with your audio conferencing participants as well as yourself through your device.

Direction Finding

The ability to recognize the direction of the person speaking in the room.


The ability to steer the directionality of the device’s microphones. Beamforming improves noise and echo cancelling as well as the overall quality of the device’s pickup.  This feature works in conjunction with direction finding.

LED Indications

LEDs indicate the voice pickup and direction as well as muting.

Each Unit Includes:

USB cable

48V Power Supply

International power supply adaptor

Phone cable

User manual


Dimensions: 7″ diameter / 1-7/8″ height

Weight: 2 lbs

Metal case and metal grill mesh for high RFI immunity and product durability

High RFI immunityand product durability

Noise Cancelling

Filters out ambient room noise such as air conditioning and background office or traffic noise

Acoustic Echo Cancellation

Prevents your microphone from transmitting the voice picked up from your speaker

Automatic Gain Control

Automatically adjusts your microphone sensitivity so that you are heard loud and clear regardless of your tone and distance from the device


Improves audio pick up quality in reverberant rooms with hard reflective surfaces such as exposed, concrete, marble, or glass walls and ceilings


Steering or directing an audio beam to pick up audio only from the direction of the person speaking, while canceling noise from all other directs



PSTN (Analog Telephones)

Daisy Chaining



Connects to your computer via USB

  • Use this connection for video conferencing sessions or softphone calls. The Spider is compatible with cloud conferencing apps such as Zoom, Skype For Business, BlueJeans, Chromebox For Meetings, etc.

Connects to PSTN/POTS line via telephone cable

  • Use this connection to make calls through your telephone infrastructure. The PSTN Spider is compatible with any standard analog phone telephone call.

Controls On The Device:

– Speaker Volume

– Microphone Sensitivity

– Mute

– Phone Dialing

– Advanced Menus

Powering Options:

– External Power Supply

– Power Daisy Chaining


Frequency Response 50Hz—16KHz

Low latency (10ms)

Broadcast level (peak): 92dB SPL @1m (5 watts RMS)

Three-way bridging capability

Noise cancelation > 10dB (without pumping noise)

100% full duplex – no attenuation (in either direction) during full duplex

High-end performance confirms to ITU-T G.167

Acoustic echo cancelation > 40dB/sec

Residual echo is suppressed to the environment noise level, preventing artificial ducking of signal

4 high-quality directional microphones

Beam-forming algorithm (forms and directs audio beams towards a define direction)

Automatic voice-level adjustment (AGC)

Spider MT502 User Manual

Spider MT502 Datasheet