Description
The AudioCodes Mediant 1000B M1KB-D5 ships pre-configured with a dual T1/E1 span providing 30 simultaneous VoIP channels and includes PSTN fallback capability — keeping critical voice traffic connected to the public switched telephone network during IP network outages. Five expansion bays remain open for additional modules. The combination of dual-span capacity and built-in PSTN survivability makes the M1KB-D5 well-suited for sites where both call volume and emergency connectivity continuity are priorities.
The Telecom Spot Take
The M1KB-D5 differentiates from the M1KB-D2 with its PSTN fallback feature — an important distinction for any deployment where voice service continuity is a compliance or safety requirement. Thirty concurrent channels handles a solid mid-market call volume, and the PSTN fallback means that if your IP network or SIP provider experiences an outage, calls route directly to the PSTN rather than failing silently. This makes the M1KB-D5 particularly attractive for branch offices, healthcare sites, and any location where emergency call capability cannot be interrupted. The five remaining bays leave plenty of room for growth.
Key Features
- Dual T1/E1 span, 30 VoIP channels: Ready for immediate deployment with meaningful call capacity — no module installation required.
- PSTN fallback built in: Automatic routing to PSTN during IP network or SIP server outages — critical for E911 compliance and business continuity.
- 5 open expansion bays: Add T1/E1, BRI, or analog modules to grow capacity without replacing the chassis.
- 2 Gigabit Ethernet ports: Dual GE interfaces for SIP connectivity and optional network redundancy.
- SIP, H.323, and MGCP: Full protocol support for any VoIP platform or SIP trunking provider.
- E-SBC via software license: Session border controller capability available on the same hardware.
- 1U rack-mountable: Standard 19-inch rack form factor.
Technical Specifications
| Specification | Detail |
|---|---|
| Part Number | M1KB-D5 |
| Pre-Installed Module | Dual T1/E1 span |
| Voice Channels | 30 simultaneous VoIP channels |
| PSTN Fallback | Yes — automatic PSTN routing on IP/SIP failure |
| Open Expansion Bays | 5 (of 6 total) |
| GE Network Ports | 2 × 10/100/1000Base-T |
| Power Supply | Single AC (redundant PSU bay available) |
| Form Factor | 1U rack-mountable |
| Signaling Protocols | SIP (RFC 3261), H.323, MGCP |
| Voice Codecs | G.711, G.723.1, G.726, G.727, G.729A/AB, iLBC, GSM |
| Fax | T.38 fax relay |
| Max Voice Channels (fully populated) | Up to 192 |
| Management | Web GUI, SNMP, EMS, CLI |
| Vendor | AudioCodes |