Bridge traditional E1/T1/PRI trunks, legacy PBX systems, and PSTN services into SIP, IPPBX, softswitch, and IMS networks with 1, 2, and 4-span digital gateway options.
OpenVox digital gateways bridge traditional trunk access into IP voice networks, helping teams keep PBX/PSTN services online while moving to IPPBX, SIP server, softswitch, or IMS platforms.
Start with the model that matches the number of digital trunk spans, signaling mode, and concurrent-call target the site must support.
1 span / up to 30 calls
Start with one E1/T1/PRI span for PBX/PSTN interconnection, branch migration, or low-density trunk access.
2 spans / up to 60 calls
Use two spans when a site needs 60-call capacity for PBX coexistence, branch aggregation, or staged carrier migration.
4 spans / up to 120 calls
Use four spans for up to 120 calls in call centers, operator access, or enterprise voice systems.
1, 2, or 4-span L20X line
Choose the L20X line for established operator and call-center projects that need 1, 2, or 4 T1/E1 spans.
Use OpenVox digital gateways where existing trunks, PBX equipment, or carrier interconnection must stay online while voice services move to IP.
Connect legacy PBX systems to SIP, IPPBX, or softswitch platforms while keeping existing trunks in service.
Use PRI, R2, or SS7 signaling support for carrier-side and operator gateway projects.
Scale from 30 to 120 concurrent calls by selecting 1, 2, or 4-span models.
Support enterprise branch interconnection and remote voice access without redesigning the whole voice edge.
Plan the E1/T1 side, IP voice side, and service handling together so legacy trunks can move into SIP networks with fewer rollout surprises.
Compare trunk capacity, IP integration, voice handling, management, and hardware differences across OpenVox E1/T1 gateway models.
| Specification | DGW-L301 | DGW-L302 | DGW-L304 | DGW-L20X |
|---|---|---|---|---|
| Trunk Capacity | ||||
| Digital trunk interfaces | 1 E1/T1/PRI | 2 E1/T1/PRI | 4 E1/T1/PRI | 1/2/4 E1/T1 |
| Concurrent calls | 30 | 60 | 120 | 30/60/120 |
| Signaling | PRI / SS7 / R2 | |||
| IP Integration | ||||
| IP voice side | SIP / IAX2 | |||
| Compatible platforms | Asterisk, Issabel/Elastix, 3CX, FreeSWITCH, VOS, BroadSoft, SIP server, softswitch, and IMS platforms | |||
| Routing rules | 512 routing rules with flexible routing settings | |||
| Trunk management | Port groups, trunk groups, and trunk priority | |||
| Number handling | Caller and callee number manipulation | |||
| Voice And Service Handling | ||||
| Voice codecs | G.711A/U, G.729, G.722, GSM; L20X also lists G.723 | |||
| Fax modes | T.38 / pass-through fax | |||
| Echo cancellation | Supported | |||
| Status visibility | Interface status, channel status, call status, SIP/IAX2 and routing status | |||
| Management And Diagnostics | ||||
| Local administration | Web GUI / HTTPS and SSH access | |||
| Remote management | Auto Provision, SNMP, TR069, and OpenVox Cloud Management | |||
| Diagnostics | Interface status, channel status, call status, logs, and network capture | |||
| Integration path | OpenAPI or AMI paths for custom operations integration | |||
| Physical | ||||
| Network ports | 2 x 10/100 Mbps | 2 x 1000 Mbps | WAN + LAN | |
| Console / local access | RS232 (RJ45) | Web GUI / SSH | ||
| Chassis size | 232 x 152 x 45 mm | Varies by L20X variant | ||
| Weight | 1.2 kg | 1.3 kg | 1.4 kg | Varies by L20X variant |
| Max power | 12 W | Varies by L20X variant | ||
| Power supply | 12 V / 1 A | Varies by L20X variant | ||
| Operating temperature | 0°C ~ 50°C | |||
| Storage temperature | -20°C ~ 70°C | |||
| Humidity range | 10% ~ 90% non-condensing | |||
Use OpenVox product pages, technical documents, and support channels to validate trunk span, signaling, routing, and deployment requirements.
Download
Review each E1/T1 gateway model page for product resources, images, and configuration details.
Download
Use product documents to verify interfaces, signaling, capacity, codecs, management features, and physical specifications.
Support
Use the support path for deployment guidance, firmware updates, troubleshooting, and post-purchase maintenance material.
Planning
Share trunk count, signaling mode, PBX or SIP platform, site count, quantity, and pricing requirements with OpenVox.
Tell OpenVox your trunk count, signaling mode, PBX or SIP platform, concurrent-call target, site plan, and quantity. We will help confirm the right DGW model for your deployment.
