
HT818
Analog Telephone Adaptors
View productCohesive Technologies — authorised Grandstream distributor in India
Network integration between PSTN and POTS has never been so easy. The HT503 is a hybrid analog telephone adapter and VoIP router that enables the user to create an easily integrated hybrid solution with backup lifeline support.
The HT503 enables an integrated hybrid deployment between PSTN and VoIP environments. Users can utilize “Hop-on and hop-off” calling through its FXO and FXS port that enables remote call origination and termination to and from the PSTN line. This ATA features 1 analog telephone FXS port and 1 PSTN line FXO port. Users can utilize the device for extension of a VoIP service to 1 analog phone with the FXS port. In addition to being SIP compliant, this product features support for up to 2 SIP account profiles, excellent voice quality, and advanced telephony features.

More Analog Telephone Adaptors from Grandstream
Answers to common questions about the HT503 ATA — buying it in India, documentation and support.
Network integration between PSTN and POTS has never been so easy. The HT503 is a hybrid analog telephone adapter and VoIP router that enables the user to create an easily integrated hybrid solution with backup lifeline support.
Key features of the HT503 ATA include: 1 FXS analog telephone ports (RJ11), 1 PSTN line FXO port, dual 10/100 Mbps ports with integrated NAT router; Advanced telephony features include caller ID, call waiting; 3-way voice conference, transfer, forward, do not disturb, message indicator, multi-language voice prompts, T.38 fax, flexible dial plan and more; Supports up to 2 SIP accounts; Status LED for power, telephone and network ports, and message waiting indication.
Cohesive Technologies is the authorised distributor of Grandstream Networks in India and supplies the HT503 ATA across the country. Call +91 120 4830000, WhatsApp +91 7290000544 or email info@grandstreamindia.com for a quote.
You can download the official HT503 ATA datasheet (PDF). It lists the full technical specifications.
Yes. Cohesive Technologies offers consultation, installation, configuration, technical support and extended warranty for Grandstream products across India. See our support services.
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