Answer
Sep 16, 2026 - 02:37 PM
SIP compatibility is a vital consideration because it ensures your adapter will work seamlessly with most VoIP service providers and PBX systems. The best Polycom Adapters are fully SIP-compliant, making them versatile and easily integrated into various environments. Both the Poly ATA 400 1FXS and Poly ATA 402 2FXS are designed to work with any SIP-compliant internet telephone service, supporting up to four SIP accounts. This broad compatibility allows you to use your adapter with a wide variety of service providers and adapt to future changes in your telephony infrastructure.
