Stainless intercom
A stainless steel SIP intercom for cleanrooms and sterile production areas, with a sealed keypad, hands-free calling and PoE power.
Overview
The PT-IP-MT9 combines a brushed SUS304 stainless steel face with a sealed handset and keypad, making it suitable for cleanrooms, laboratories and sterile production areas. The slim, wall-mounted housing is easy to clean around.
It uses standard SIP and RTP over IP, with a 3W speaker and support for PoE or DC power. The phone can auto-answer for room monitoring and supports speed dialing and clear, echo-free voice.
Capabilities
A brushed stainless face with a shallow, continuous surface and a perforated speaker field — no grille or recessed tray to hold particles.
The keypad sits flush in its cutout and can be wiped as part of the room routine without liquid reaching the electronics.
Stainless ring buttons below the dial pad can be set as Emergency call and Handfree, or supplied as SERVICE and CALL without a keypad.
The phone can answer automatically for room monitoring, with hands-free audio through the speaker and microphone.
The 250 × 150 mm face fits a standard wall cutout with a shallow back box, so the plate sits close to the cleanroom wall.
One PoE cable can carry power and data; a DC terminal is provided where PoE is not available.
Call another phone by IP address with no registrar, or register three SIP accounts with primary and backup servers.
Marking to eight targets, local broadcast, manual alarm over multicast or UDP, and multicast paging are all available from the same firmware.
Built details
The PT-IP-MT9 is built around a flat SUS304 stainless faceplate with a sealed keypad and a perforated speaker field. There is no recessed tray or exposed seam to hold dust; the front can be wiped as part of the room routine. Two ring-lit buttons below the keypad can be configured as Emergency call and Handfree, or the face can carry SERVICE and CALL buttons instead. The same V3s core sits behind the plate.
The faceplate is brushed SUS304 with a shallow, continuous surface. The speaker is a field of small holes rather than a grille that can trap particles, and the keypad sits flush in its cutout. It is designed for wipe-down cleanroom routines.
Below the dial pad are two stainless ring buttons, illuminated around the edge. On this face they are labeled Emergency call and Handfree; the same hardware can be supplied with SERVICE and CALL buttons and no keypad for a simpler two-button point.
The 250 × 150 mm face fits a 231 × 133 mm cutout with 50 mm behind the wall. A single PoE cable can carry power and data; a DC terminal is provided where PoE is not available. The phone auto-answers for room monitoring and supports speed dial.
Every unit is assembled to order. Tell us the site conditions and we will confirm the enclosure, keys and power.
Discuss your siteThe shared platform
Waterproof, explosion-proof, cleanroom and intercom phones are not four different phones inside. They share one Allwinner V3s control board and one firmware; the site conditions decide the enclosure, keypad, handset, buttons and beacon around it. Every model can also call another phone directly by IP address, with no PBX in the path.
What changes
Flat stainless or smooth ABS faces, sealed keypads and flush back boxes. No dirt traps, no fans, no exposed seams.
Inside every version
The web interface on a waterproof phone is the same interface on the explosion-proof and cleanroom units. The enclosure changes what the firmware can drive — a beacon here, a relay there, a camera on the door panel. The call flow, paging stack and alarm logic do not change, and two phones can call each other directly by IP address without a PBX or registrar.
Each input, relay, LED and function key reports its state on the home page as it changes.
Paging, alarm and control
Three independent registrations, each with a primary and backup server, session timer, SRTP option and PCMU / PCMA / G722 / G729 codecs.
Hold a function key and up to eight target phones loop a marking tone; release to stop. A lease timeout stops it if the network breaks.
Upload a WAV, choose the trigger and play it through the phone amplifier. An optional dial number, relay and alarm light can fire with it.
Trigger a stored alarm WAV over multicast or UDP broadcast. Phones with the same ID play their own copy, so a weak Wi-Fi AP does not block it.
Send live audio to a multicast group for site-wide paging. The status page shows when the channel is active and which group is in use.
Each function key can dial, hotline, mark, multicast, start a local broadcast, fire a relay, raise an alarm, speed-dial, answer or hang up.
The home page shows each input, relay, LED and button state as it changes. Outputs can follow ringing, calls, alarms or multicast.
USB headset support with separate microphone gain and volume, alongside handset and hands-free gain settings and selectable ring tones.
VLAN, LLDP, SNMP, NTP, Modbus, OpenVPN, ONVIF / RTSP, action URLs, SIP PnP, config backup, logs and packet capture.
Call another phone by IP address with no PBX, registrar or server in between — useful for two-point links, temporary sites and simple gate, lift or desk pairs.
Where it works
Laboratories, pharmaceutical suites and clean production areas need smooth, sealed surfaces that are easy to clean and do not trap particles. Stainless and sealed-plastic faces suit wipe-down regimes and sterile room walls.
