Digital Module SFP-E1 for Asterisk

Digital telephone module SFP-E1 with echo cancellation (30 voice channels)


  • Legacy PBX/IVR Services, Asterisk IP-PBX
  • VoIP Gateways (supports SIP, H.323 and IAX)
  • SyncPPP, Frame Relay, Cisco HDLC, Multi-link PPP
  • a-Law, μ-Law, and Linear Modes Supported
  • Line coding HDB3, AMI


Terratel SFP-E1 module is designed to integrate and connect IP-PBX, IVR systems, VoIP-gateways, other specialized solutions of the Asterisk project or FreeSwitch to office PBXs, as well as the public telephone network PSTN via the E1 interface.

Digital SFP-E1 module for Asterisk network diagram

Pic 1. Block diagram of the inclusion of a Digital SFP-E1 module for Asterisk.

Digital SFP-E1 module is designed to build digital telephony systems based on Asterisk IP-PBX and exchanges data/voice over E1 channels.

Distinctive features

The new SFP-E1 module is the latest addition to the D-201E/D-401E digital phone card family for the Asterisk project.

The SFP-E1 module design uses unique technologies to support the E1/PRI environment. The SFP-E1 module is designed to connect traditional TDM systems with voice over IP technologies in a single network.

The SFP-E1 module is installed in the sfp-slot of network equipment, which allows it to be used in any place where the network is available, and not just at the location of the Asterisk server.

The SFP-E1 digital module is compatible with all Asterisk versions and connects to Asterisk using a special DAHDI-enabled driver. A special driver with DAHDI support is available for free on the website.

The SFP-E1 module has a hardware echo cancellation function for all voice channels of the E1 stream.

Key Features

  • Up to 30 simultaneous calls per 1E1 port
  • Supports E1 physical interface connections
  • TDM protocols support: ISDN PRI, CAS
  • Industry standard RJ-45 port
  • SFP form factor