ONVIF / VMS audio
Use the documented ONVIF interface for compatible video management system (VMS) audio workflows. Confirm the required operation with the selected platform and firmware.
IP Paging Gateway
ST-A2IIP Paging Gateway
ST-A2I: 10/100 Base-TX, RJ45 network interface; Aluminium construction. Review the complete technical data and system connections below.
- Network Interface
- 10/100 Base-TX, RJ45
- Power Supply
- 12V-2A
- Material
- Aluminium
Overview
The ST-A2I is a SIP-enabled analogue-to-IP paging gateway for recorded-message broadcasting, notifications, scheduled announcements, SIP paging and streamed audio.
Plan network connectivity, operator workflow, mounting and power as part of the complete communication system. Explore the application guides for deployment considerations.
Key features
- Produce Loud & excellent sound
- Can convert Analog speakers/amplifiers to IP
- 48K OPUS Audio Codec enables excellent sound quality
- Compatible with VoIP, SIP devices (IPPBX, IP Phone) via SIP
- Compatible with IP Camera VMS via ONVIF
- Support Pre-recorded messages
- Support HTTP API for alarm in transmit
System integration
HTTP API integration
The model documentation lists an HTTP API for alarm transmission. Define the event, request format and required response with our team before configuring the integration.
Technical specifications
ST-A2I| Parameter | Specification |
|---|---|
| Audio | |
| Codec | OPUS 48 kHz, MP3 44.1 kHz, G.722 ADPCM 16 kHz, G.711 PCMU 8kHz, G.711 PCMA 8 kHz |
| Network | |
| Security | Password protection, IP address filtering, Digest authentication, User access log, firewall |
| Network Protocol | SIP, ONVIF, HTTP, HTTPS, IPv4, DHCP, RTSP, RTP, RTCP, TCP/IP, UDP, ARP, SNMP, TFTP, NFS, NTP, FTP, ICMP, SSH, SSL, DNS, SNTP |
| Network Interface | 10/100 Base-TX, RJ45 |
| VoIP | Support for SIP protocol for integration with VoIP systems, integrated with SIP/PBX. 2 SIP Accounts, SIP Direct IP Call, RTP Multicast, ONVIF Codec: OPUS, MP3, G.722, PCMU, PCMA |
| General | |
| Material | Aluminium |
| Power Supply | 12V-2A |
| Dimensions | 187x160x40 mm |
| Net Weight | 1.10 Kg |
| Standard Warranty | 1 year |
| Languages | English |
| Approvals & Compliances | ISO 9001:2015, ISO 27001:2022, CE, RoHS, FCC |
| Package Includes | IP Paging Gateway, Adapter, User Manual |
Confirm the required configuration and current product documentation before procurement.
Product documentation
Product documents are available to approved SipTok partners and invited project teams.
Partner document accessSYSTEM CONNECTIONS
Where ST-A2I fits.
The ST-A2I supports SIP paging and connections for existing analogue speakers, a microphone and an amplifier. Match the actual interfaces before integrating an existing PA installation.
SIPTOK · SCHEMATIC DIAGRAM
ST-A2I between SIP paging and analogue PA
Ethernet / LANAnalogue audio / wired outputSelect a product photograph for model details
Scroll across the diagram to explore each connection.
01 · Control room & system control
Example SIP operator phoneST-SP10IP Phone (Basic)Ethernet / LANView product
02 · Site network
Example Ethernet switchST-PoE-8P8 Port PoE SwitchLAN switch · independent power reviewView product
03 · Application zones
Selected SIP paging gatewayST-A2IIP Paging GatewayEthernet / LANThis model
Existing equipment; match connection and loadAnalogue amplifier / speakersConfirmed analogue interface
01
IP paging to existing audio
Use the gateway’s documented analogue connections to bring compatible existing PA equipment into an IP paging design.
02
Interface coordination
Confirm input/output direction, signal level, amplifier connection and speaker load from current installation documentation before wiring.
Connection, power & commissioning notes
- Ethernet branches connect the shown IP devices to the site LAN switch. This is a connection concept, not a cable-routing or electrical wiring drawing.
- SIP handles call setup. RTP audio follows the configured media path; it does not necessarily pass through the SIP server. Multicast is a separate, model-supported paging option.
- Confirm power for each device independently. A PoE switch in this example does not establish the required PoE class, port budget or a universal one-cable installation.
- The schematic does not imply that any analogue speaker or amplifier can be connected without checking its electrical interface.
Photographs show actual SipTok models. This is a conceptual connection diagram; cable routes, power and final equipment are confirmed during system design.
APPLICATIONS
Where ST-A2I fits.
Explore the operating environment and communication requirements for each use case.
Industry & ManufacturingExisting analogue PA installations
Evaluate the gateway when retaining suitable analogue audio equipment in a network paging design; verify every audio interface.
Explore the solution
Commercial BuildingsBuilding audio upgrades
Coordinate the existing amplifier and speaker connections with the gateway’s current installation documentation.
Explore the solution
Education & CampusesCampus paging upgrades
Plan supported SIP paging to compatible retained PA equipment and test the intended zone arrangement.
Explore the solutionPRODUCT SELECTION & INSTALLATION
Questions about ST-A2I.
Review the model’s connection, installation and documentation before finalizing the system.
Ask a product expertCan ST-A2I work with a SIP platform?
The model’s published VoIP data lists SIP support. Match the platform, codecs, registration and required paging or calling workflow, then test the selected configuration before deployment.
Does ST-A2I support VMS and API integration?
The model documentation lists VMS compatibility via ONVIF and an HTTP API for alarm transmission. Agree the required audio action or alarm exchange, and confirm the selected platform, firmware and interface details with SipTok.
What power arrangement is listed for ST-A2I?
The published power-supply field states “12V-2A”. Check the installation supply and the current model document.
What should I include in a ST-A2I enquiry?
Include the model, quantities, site layout, intended workflow and connected equipment. For a complete system, share paging zones, network and power availability, and any BOQ, RFP or configuration support required.
LET’S START A CONVERSATIONDiscuss your
Discuss your
IP PA project.
From product selection to system planning, share your requirements with the SipTok team.
Explore project engineering supportEmail our teamsales@siptok.in
WhatsApp+91 8590528734
Registered address & manufacturing unitN-189, Pocket N, Sector 2, DSIIDC, Bawana Industrial Area, Delhi – 110039, India