Analog Telephone Adaptors (HT) — The HT range connects existing analog phones, fax machines and door phones to a SIP system. Models scale by port count — one and two ports for a desk or small office, four and eight ports where a floor or building still has analog handsets worth keeping.
FXS vs FXO — FXS ports connect analog devices (phones, fax) to your IP system, which is what most HT models do. FXO is the reverse: the HT841 and HT881 connect analog lines from the exchange into a VoIP system, useful where PSTN lines must stay in service.
High-Density Gateways — The GXW4200 Series is the higher-density FXS option, aimed at deployments where many analog extensions need to be carried on an IP platform without replacing every handset at once.
Why It Matters — Most migrations are gradual. Gateways and ATAs let a business move to IP telephony while keeping fax lines, lift phones, hooter circuits and legacy handsets working — spreading cost and avoiding a risky single-weekend cutover.
Single-port analog telephone adaptor for connecting one analog phone or fax machine to a SIP phone system.
Updated single-port ATA refreshing the HT801 for current deployments while keeping the same simple setup.
Two-port analog telephone adaptor — the common choice for a small office keeping a phone and a fax line on IP.
Updated two-port ATA carrying the widely deployed HT802 design forward for new installations.
Two-port ATA with Gigabit networking, suited to sites where the adaptor sits inline on a fast data connection.
Refreshed two-port Gigabit ATA for current deployments needing analog ports without slowing the data path.
Hybrid adaptor with both FXS and FXO, letting a site connect an analog phone and keep a PSTN line as backup.
Four-port analog telephone adaptor for offices carrying a handful of analog extensions onto an IP system.
Updated four-port ATA continuing the HT814 for new four-extension analog deployments.
Eight-port analog telephone adaptor — the density option for a floor or building still running analog handsets.
Refreshed eight-port ATA for larger analog-to-IP migrations that need many ports in a single unit.
Analog FXO gateways bringing PSTN exchange lines into a VoIP system, for sites that must keep existing landlines in service.
High-density FXS VoIP gateway series for carrying large numbers of analog extensions on an IP phone platform.
Keep working analog phones, fax lines and lift circuits in service while the rest of the business moves to IP.
FXS models bring analog devices onto SIP; HT841/HT881 FXO gateways bring PSTN lines in — both directions handled.
From a single-port HT801 to the eight-port HT818 and the high-density GXW4200 Series, port count scales with the site.
HT and GXW devices auto-provision and sit comfortably alongside UCM, Asterisk, 3CX and other standard SIP platforms.
Very few businesses replace every phone at once. There is usually a fax line that cannot move yet, a lift phone tied to a maintenance contract, or a floor of perfectly serviceable analog handsets. Grandstream's HT and GXW ranges exist for exactly that gap: they let an organisation adopt IP telephony now and retire analog equipment on its own schedule, rather than forcing a single high-risk cutover weekend.
The distinction that matters when specifying is FXS versus FXO. FXS ports connect analog devices — phones, fax machines, door phones — into a SIP system, and that covers most of the HT range, from the single-port HT801 through the two-port HT802 and HT812, the four-port HT814, and the eight-port HT818, each with a current v2 revision. FXO works the other way, bringing analog exchange lines into a VoIP platform, which is the role of the HT841 and HT881; the HT813 is the hybrid, offering both an FXS port and an FXO port so a site can keep a PSTN line available as a fallback path. Where the analog extension count runs higher than a desktop adaptor sensibly handles, the GXW4200 Series provides the same function at density.
Getting the port count and the FXS/FXO split right at the survey stage saves a great deal of rework later. As an authorized Grandstream distributor, Cohesive Technologies helps audit what analog equipment must stay, specifies the right adaptors and gateways, and supplies genuine stock at competitive prices with nationwide delivery across India, Sri Lanka, Nepal and the Maldives, backed by full technical support.
Authorized distributor · FXS & FXO · 1 to 8 ports and beyond · Best price in India · Free consultation · Nationwide delivery
