IP PBX · small business

OM50G IP PBX — up to 12 analog ports and 62 SIP trunks

The step up from the OM20G: up to three interface cards, twelve analog ports and 62 SIP trunks, still in a sound-box-sized chassis with local recording.

Three interface-card slots, so the port mix can grow with the site
Variants from 6 FXS up to 12S, 10S/2, 8S/4 and 6S/6
62 SIP trunks — enough for a busy sales floor
Records both locally to 16 GB and to a remote recording server
Built-in OpenVPN client for private-network SIP trunks
No 3G/4G modem support — plan a wired line for this model

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OM50G IP PBX front panel with voice port and status indicator LEDs

Pick the port mix at order time

The OM50G carries up to three interface cards. The common variants trade analog extensions against analog lines.

OM50G analog port variants

Variant	FXS extensions	FXO lines
OM50G-12S	12	0
OM50G-10S/2	10	2
OM50G-8S/4	8	4
OM50G-6S/6	6	6

Cards are 401A-4S and 401A-2S/2. Confirm the exact variant on the quotation.

Six ways to choose an outbound line

Outbound calls can be routed by rule rather than by dialling a prefix, which keeps call costs predictable.

Analog lines in sequence, or rotating across the group
SIP trunks in sequence, or rotating across the group
Smart trunk selection — local calls over analog lines, long distance over SIP
Route table — 500 rules, applied top to bottom, covering number translation, call-duration limits and directed routing

Where local recording matters

Like the OM20G, the OM50G records to its own storage as well as to a server. The larger models in the range record remotely only, so this is the point in the range where local recording stops.

Storage split is the same as the OM20G: 10 GB recording, 3 GB logs, 1 GB voice, 0.8 GB other
Full and browser-based management over the web interface

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OM50G rear panel: FXS and FXO ports, PC, WAN, USB, CON, RST and power input

Where it fits on site

Office keeping PSTN lines

Six to eight analog lines stay in use for local calls while internal traffic moves to SIP.

Clinic or small hotel

Twelve analog extensions cover rooms, with SIP for staff and common areas.

Multi-site branch

Joins a larger network as a site, with SIP trunks over a VPN to the head office.

Specifications

Capacity

Interface cards	Up to 3
Analog extensions (FXS)	6 to 12 depending on variant
Analog lines (FXO)	0 to 6 depending on variant
Maximum SIP trunks	62
Concurrent calls per trunk	120
Ring group members	Up to 40 extensions

Interfaces & storage

Ethernet	2 × 100M (PC + WAN), switched, one shared IP address
Default IP	DHCP; falls back to 192.168.2.218
Internal storage	16 GB
USB	USB storage device
Console	CON, RJ45 to RS232
Power	Adapter supplied with the unit

Features & management

Recording	Remote and local
3G/4G USB modem	Not supported
OpenVPN client	Built in
Dual hot standby	No
Ping diagnostics	Yes
Port capture	Supported, up to 200 seconds
Initial admin password	Random, printed on the label on the back of the unit

iSpecifications are taken from the OM series product manual. Variant availability and final configuration are confirmed on the quotation.

Choosing between options

Model	Specifications
OM20G	Up to 4 analog ports · 24 SIP trunks · 16 GB storage · 3G/4G USB modem
OM50G	Up to 12 analog ports · 62 SIP trunks · Local + remote recording · OpenVPN client
OM80E	Up to 48 analog ports · 216 SIP trunks · AC 100–240 V or −48 V DC · Remote recording
OM200G	4 hot-swap slots · Up to 96 analog ports · 496 SIP trunks · 2 × gigabit Ethernet
OM1000-UC	1000 SIP trunks · 4 × gigabit interfaces · Dual hot standby · DID/DOD support

Compatibility boundaries

This model uses standard SIP and the interfaces listed in the specification table. Confirm the PBX, SIP provider or platform against those interface notes before the order; where the documentation does not state a value, the table records it as not stated rather than estimating. PoE, analog port variants, power options and card compatibility are fixed at order time.

Handover, spares and support

Extension plan, provisioning and interface language can be prepared before dispatch. Remote support continues after handover. Spare-part, warranty and service terms are confirmed in the quotation for the models and quantity ordered, so they are not printed as a single figure here.

Where it sits in the system

SIP desk phones

Hotel phones

Guest-room handsets with wake-up and room-status integration.

Public address & paging

Page extensions over the same SIP network.

Frequently asked questions

Why choose the OM50G over the OM20G?

Two reasons: more analog ports (12 instead of 4) and more SIP trunks (62 instead of 24). If you need neither, the OM20G is cheaper. Note the OM50G does not support a 3G/4G USB modem, so if cellular backup matters, the OM20G is the one to pick.

Can I mix analog and SIP phones?

Yes. Analog phones connect to the FXS ports and SIP phones register over the network. Both take extension numbers from the same dial plan, and extension numbering starts at 200.

How does outbound call routing work?

Six selection modes are available, including a smart mode that sends local calls over analog lines and long distance over SIP trunks, plus a 500-entry route table for number translation and directed routing.

Does it support fax?

Yes. A fax machine connects to an FXS port, and faxing runs as T.38 or G.711 pass-through. Fax over an analog line requires G.711 pass-through; where the platform supports both, T.38 is recommended.

Standards referenced

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Planning an IP telephony project?

Send us the site type, the number of extensions or rooms and the areas to cover — we will come back with a configuration and quotation.