{"product_id":"zultys-mg4-4-port-fxo-analog-voip-gateway-sip-pstn-trunk-pbx-integration-wty","title":"Zultys MG4 4-Port FXO Analog VoIP Gateway SIP PSTN Trunk PBX Integration Wty","description":"\u003cdiv style=\"font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Arial,sans-serif;font-size:14px;line-height:1.7;color:#222;max-width:700px;margin:0 auto;\"\u003e\n\u003ch2 style=\"color:#0060a9;font-size:22px;margin-bottom:8px;\"\u003eZultys MG4 4-Port FXO Analog VoIP Gateway\u003c\/h2\u003e\n\u003cp\u003eThe Zultys MG4 is a compact 4-port FXO analog VoIP gateway that bridges existing PSTN analog phone lines to a modern SIP-based VoIP PBX — backed by a 12-month Reboot IT warranty. Retain your analog PSTN lines and existing phone numbers while migrating to VoIP, without replacing your entire phone infrastructure.\u003c\/p\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;\"\u003eKey Benefits\u003c\/h3\u003e\n\u003cul style=\"padding-left:20px;\"\u003e\n\u003cli\u003e\n\u003cstrong\u003e4 x FXO Ports:\u003c\/strong\u003e Four analog PSTN line inputs allow up to four simultaneous incoming or outgoing calls through your existing phone lines via the VoIP PBX.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePSTN-to-VoIP Bridge:\u003c\/strong\u003e Connects analog PSTN lines directly to SIP-based PBX systems — preserving existing phone numbers and PSTN lines during a VoIP migration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBroad PBX Compatibility:\u003c\/strong\u003e Works with Zultys MX, 3CX, Asterisk, FreePBX, and any standards-based SIP PBX — not locked to a single vendor ecosystem.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCost-Effective Migration:\u003c\/strong\u003e Add VoIP capability progressively while keeping PSTN as a fallback or primary trunk — no big-bang cutover required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact \u0026amp; Mountable:\u003c\/strong\u003e Small form factor suitable for rack or wall mounting — fits in a server room, comms cabinet, or IT closet.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandards-Based SIP:\u003c\/strong\u003e Uses standard SIP signalling and RTP for audio, ensuring compatibility with virtually any modern VoIP PBX or hosted SIP trunk provider.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;\"\u003ePerformance in Use\u003c\/h3\u003e\n\u003cp\u003eFor businesses moving from traditional PSTN to VoIP, the MG4 solves the most common migration challenge: what to do with existing analog phone lines. Rather than cancelling all PSTN lines immediately, the MG4 lets you run PSTN and VoIP in parallel. Incoming calls arrive on PSTN lines, are received by the MG4, and delivered to the VoIP PBX as SIP calls, routing to IP phones throughout the office.\u003c\/p\u003e\n\u003cp\u003eFor businesses already on a VoIP PBX that want to retain PSTN as a backup trunk — for redundancy if the internet fails — the MG4 provides exactly that. With four simultaneous call paths, it handles the busiest periods in most SMB environments. Failover configurations can route calls to PSTN automatically if the SIP trunk or internet connection drops.\u003c\/p\u003e\n\u003cp\u003eThe MG4's broad SIP compatibility means it works with popular open-source PBXs like FreePBX and Asterisk as well as commercial systems including 3CX and Zultys MX. Configuration is straightforward via a web interface, and standard SIP\/RTP ensures no proprietary codecs or licensing are required.\u003c\/p\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;\"\u003eTech Specs\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;\"\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;width:40%;\"\u003eFXO Ports\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003e4 x RJ-11 analog PSTN line inputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eSimultaneous Calls\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eUp to 4\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eProtocol\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eSIP (RFC 3261), RTP\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eNetwork\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003e10\/100 Ethernet\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003ePBX Compatibility\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eZultys MX, 3CX, Asterisk, FreePBX, any SIP PBX\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eManagement\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eWeb-based interface\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eForm Factor\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eCompact, rack or wall mountable\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003ePower\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eExternal AC adapter\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eWarranty\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003e12 months — Reboot IT\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;margin-top:20px;\"\u003eIs It Right for You?\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;\"\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;background:#f0f8f0;width:50%;font-weight:bold;\"\u003eBest For ✓\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;background:#fff8f8;font-weight:bold;\"\u003eNot For ✗\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eBusinesses migrating from PSTN to VoIP\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eEnvironments with no analog PSTN lines\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eRetaining existing phone numbers during migration\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eHigh-call-volume contact centres (4 lines max)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003ePSTN failover\/backup for VoIP PBX systems\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eDirect connection to analog handsets (FXO, not FXS)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003e3CX, FreePBX \u0026amp; Asterisk deployments\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eNon-SIP proprietary PBX systems\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;margin-top:20px;\"\u003eCondition Grades\u003c\/h3\u003e\n\u003ctable style=\"width:100%;border-collapse:collapse;font-size:13px;\"\u003e\n\u003ctr style=\"background:#0060a9;color:#fff;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #004d8a;font-weight:bold;\"\u003eGrade\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #004d8a;font-weight:bold;\"\u003eCondition\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #004d8a;font-weight:bold;\"\u003eCosmetics\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eA — Excellent\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eFully tested \u0026amp; working\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eMinimal marks or scuffs, near-new appearance\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"background:#f5f5f5;\"\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;font-weight:bold;\"\u003eB — Good\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eFully tested \u0026amp; working\u003c\/td\u003e\n\u003ctd style=\"padding:7px 10px;border:1px solid #ddd;\"\u003eLight wear, scratches or marks visible on chassis\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ch3 style=\"color:#0060a9;border-bottom:2px solid #0060a9;padding-bottom:4px;margin-top:20px;\"\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp class=\"faq-q\" style=\"font-weight:bold;margin-bottom:2px;\"\u003eWhat is the difference between FXO and FXS ports?\u003c\/p\u003e\n\u003cp class=\"faq-a\" style=\"margin-top:0;margin-bottom:14px;\"\u003eFXO (Foreign Exchange Office) ports connect to PSTN lines from the telephone company — this is what the MG4 has. FXS ports connect to analog handsets or fax machines. The MG4 bridges PSTN lines to a SIP PBX; it does not connect directly to analog handsets.\u003c\/p\u003e\n\u003cp class=\"faq-q\" style=\"font-weight:bold;margin-bottom:2px;\"\u003eWhat PBX systems does the MG4 work with?\u003c\/p\u003e\n\u003cp class=\"faq-a\" style=\"margin-top:0;margin-bottom:14px;\"\u003eThe MG4 is compatible with any standards-based SIP PBX including Zultys MX, 3CX, Asterisk, FreePBX, and most hosted SIP trunk providers. It uses standard SIP\/RTP so it works with virtually any modern VoIP system.\u003c\/p\u003e\n\u003cp class=\"faq-q\" style=\"font-weight:bold;margin-bottom:2px;\"\u003eHow many simultaneous calls can the MG4 handle?\u003c\/p\u003e\n\u003cp class=\"faq-a\" style=\"margin-top:0;margin-bottom:14px;\"\u003eUp to 4 simultaneous calls — one per FXO port. Each port corresponds to one PSTN line, so total concurrent call capacity matches the number of active PSTN lines connected.\u003c\/p\u003e\n\u003cp class=\"faq-q\" style=\"font-weight:bold;margin-bottom:2px;\"\u003eCan I use the MG4 as a PSTN backup for my VoIP system?\u003c\/p\u003e\n\u003cp class=\"faq-a\" style=\"margin-top:0;margin-bottom:14px;\"\u003eYes. Many businesses use the MG4 to provide PSTN failover — if the internet or SIP trunk fails, outbound calls can route through the PSTN lines connected to the MG4 instead.\u003c\/p\u003e\n\u003cp class=\"faq-q\" style=\"font-weight:bold;margin-bottom:2px;\"\u003eWhat are the shipping costs?\u003c\/p\u003e\n\u003cp class=\"faq-a\" style=\"margin-top:0;margin-bottom:14px;\"\u003eShipping costs apply based on size and destination — rates are calculated at checkout.\u003c\/p\u003e\n\u003cdiv style=\"background:#f0f6ff;border-left:4px solid #0060a9;padding:14px 18px;margin-top:24px;border-radius:3px;\"\u003e\n\u003ch3 style=\"color:#0060a9;margin-top:0;\"\u003e12-Month Warranty \u0026amp; Reboot IT Assurance\u003c\/h3\u003e\n\u003cp style=\"margin-bottom:0;\"\u003eEvery Zultys MG4 sold by Reboot IT is professionally inspected and tested before dispatch. Backed by a full 12-month warranty. Reboot IT has been Australia's trusted refurbished IT specialist since 2001 — visit us at \u003cstrong\u003ereboot-it.com.au\u003c\/strong\u003e.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e","brand":"Zultys","offers":[{"title":"Excellent","offer_id":51684602708289,"sku":"R-5877-EXC","price":129.0,"currency_code":"AUD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0787\/7794\/2337\/files\/zultys-mg4-4port-fxo-analog-voip-gateway-sip-r-5877-exc.png?v=1777532600","url":"https:\/\/reboot-it.com.au\/products\/zultys-mg4-4-port-fxo-analog-voip-gateway-sip-pstn-trunk-pbx-integration-wty","provider":"Reboot IT","version":"1.0","type":"link"}