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CarpeStar E1/T1 gateway

E1/T1 Gateway SMG2000L

  • Flexible and efficient VoIP Gateway Solution

With its scalable density and versatility, SMG2000L can help enable wireless and wireline service providers to add new Value Added Services (VAS) quickly, and provide a clear migration path to an all-IP network. It can scale up to 60 simultaneous IP sessions and at the same time provide media transcoding and impressive sessions per second. 

SMG2000L support voice densities ranging from 30 to 60 channels, call routing, call translation and IP transcoding in a single mini chassis for gateway operations. The integrated gateway functionality not only provides interworking between IP and TDM domains, but also automated failover from IP to TDM for outbound routing. These features help service providers looking to improve network and routing resiliency and lower TCO. These capabilities make the CMG2000L an excellent option for mobile VAS, SIP trunking, contact center and emergency service deployments, as well as for retail, wholesale, business, and enhanced Voice over IP (VoIP) services.

  • Any-to-Any Signaling and Multimedia Connectivity

SMG2000L provides any-to-any network connectivity through its ability to interwork multiple protocols used by telecommunications providers to deliver services to their retail, business and wholesale customers. It can provide interworking between ISDN, SS7, SIP formats.

SMG2000L also supports any-to-any media transcoding for popular voice codecs. T.38 and G.711 fax interworking and support for RTP, INBAND and SIPINFO method based tones and event handling complement the media transcoding capabilities to provide a high degree of flexibility to help deliver value added services economically.

  • User-friendly management and configuration toolkits

The Web graphical user interface (WebUI) is a real-time web toolkit to configure, monitor CMG2000L. It allows operators to configure and perform real-time monitoring and maintenance. Flexible SIP and Protocols configuration enable services providers and enterprises to seamlessly connect in hybrid networks, Helping configure SIP, SIP trunking, SIP Mediation, PCM, SS7and ISDN, Routing and more; And a broad range of gateway toolkits also help gateway’s maintenance and software upgrading for Web UI, gateway services and firmware.

Routing Features

  • Call routing and translation (from PCM to IP or reversely)


IP Bearer Features

  • Coder support: G.711A,G.711U, G.729 A/B,G723,G722, GSM, iLBC, RFC 2833,RF 3261,SIPINFO,INBOUND
  • Compliant with TLS/SRTP, TCP/UDP, HTTP, ARP/RARP, DNS, NTP, TFTP, TELNET, STUN and more IP protocols
  • Echo cancellation: G.168 128 ms tail length
  • Voice activity detection and packet loss concealment
  • Comfort noise generation
  • T.38 real-time fax, T.38 – G.711 interworking
  • Digit transmission via RFC 2833 (SIP)
  • Hosted NAT



  • Network Time Protocol (NTP)
  • Web User Interface (WebUI) supports configuration via browser


Power Requirements

  • AC Power Supply Range 100 – 240 VAC
  • The power supply will operate at frequencies between 47 Hz and 63 Hz


Power Consumption

  • About 15W(Normal Conditions)
  • Operating temperature range
  • 0 to +55 °C, 8-90% relative humidity non-condensing
  • Storage temperature range
  • -20 to +85 °C, 8-90% relative humidity non-condensing



  • Power supplies field installation


Physical Dimensions

  • High: 1.18 in (30 mm)
  • Wide: 7.48in (190 mm)
  • Deep: 4.72in (120 mm)
  • Weight 1.43 lb (Approx. 0.65kg)



  • Redundant power supply(Optional)
  • Smart IP probing
  • Automated failover (Ethernet and Fiber Optical links)
  • Failover via automatic protection switching


I/O Interfaces — Rear I/O — T1/E1

Telephony     Fiber Optical 1~2 T1/E1 for timing (BITS clock),  

T1 and E1              signaling and bearer traffic

                          (T1 – 100 ohms and E1 – 120 ohms)

Clock Sync    Stratum


IP Interfaces

  • Dual redundant 2 *100 Base-T Ethernet for VoIP payload and signaling


TDM Signaling Protocols

  • MF R2
  • SS7 ISUP
  • SS7 MTP1~3
  • SS7 TCAP


IP Protocols

  • Core SIP Specifications and Notable Extensions
  • RFC 3261 SIP Basic
  • RFC 3262 SIP PRACK
  • RFC 3265 SIP Subscribe/Notify


Notable SIP Extensions

  • RFC 3398 ISUP/SIP Mapping
  • RFC 3711 SRTP (for SIP)
  • Tel URI – RFC 3966
  • IP and ISUP interworking and more



  • Adaptive jitter buffer
  • Packet loss compensation
  • Configurable Type of Service (ToS) fields for packet prioritization and routing



  • Estimated MTBF per Telcordia Method 1: With Dual Redundant AC or DC Power Supplies
  • Rear I/O Type 1 — T1/E1
  • NO PSTN Interface: 150,000 hours