highlights
        
         - 1 FXS and 1 FXO PSTN line port with power-outage life line support
 - 2 SIP account profiles, SIP over TCP/TLS, SRTP
 - Dual 10/100 Mbps network ports (RJ45) with integrated high performance NAT router
 - Advanced telephony features
 - Comprehensive voice codecs/T.38 Fax
 - Secure and automated provisioning using HTTP/HTTPS/Telnet/TFTP
 - Symmetric and asymmetric voice codec/RTP in any call sessions
 - Web management for easy configuration and installation
 - Hop-on/Hop-off calling
 - Offers traditional and advanced telephony features
 - Portable and compact for use at home or on the road
 
resources spotlight
    
   
- The HandyTone 503 offers the next generation of powerful, affordable, high quality and manageable IP telephony ATA/IAD. The integration of a FXO and FXS port enables remote call origination and termination to and from the PSTN line, known as "hop-on and hop-off" calling. This functionality coupled with its compact size makes it an ideal solution for road warriors seeking the savings and benefits of voice-over-ip communication
 - Based on SIP standard and interoperable with most 3rd party SIP compliant devices and software
 - Dual 10M/100Mbps network ports, port status and message waiting LED, and a base stand for vertical positioning
 - Traditional and advanced telephony features including mutli language voice prompts and transfer to or forward to IP or PSTN
 
- Ethernet Ports 2 RJ45 (LAN/WAN)
 - NAT/Router Yes
 - DHCP Client/Server
 - FXS Port 1
 - FXO Port 1
 - PSTN Pass-through Port yes
 - Voicemail Indicator Yes
 - Voice Codec G.711(a/u-law), G.723.1, G.729A/B/E, G.726-40/32/24/16 and iLBC, T.38 fax
 - Remote Configuration HTTP/HTTPS/Telnet/TFTP Provisioning
 





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