Yeastar TA400 Gateway The Yeastar TA400 Gateway is a multi-port FXS Gateway including 4 FXS ports, line echo cancellation and compatible with both SIP and IAX2, the TA400 is ideal for small and medium enterprises that want to integrate a traditional phone system into an IP-based system. Yeastar TA400 Gateway Features Fully SIP and IAX2 compliant. Supports 4 FXS ports. Flexible communication rules. Reliable fax performance with T.38. Provides high quality audio compression using industry standard codecs. Line echo cancellation for 32, 64 or 128 ms echo delay. Excellent interoperability with a wide range of legacy equipment and IP equipment.