What is SFP VoIP E1 Converter

SFP VoIP E1 converter of Terratel brand can be used in any place where the network is available. Physical connection to the office PBX or PTN (public telephone network) is made via E1 interface (RJ-45 connector), and to IP network — via sfp-slot.

Main Specifications of SFP VoIP E1 Converter

SFP VoIP E1 converter is equipped with a standard RJ-45 port, and supports:

• Up to 30 simultaneous calls per port 1E1, towards the IP network — SIP protocol.
• E1 physical interface connection (G.703).
• PSTN protocols: PRI (DSS1, QSIG, Q.931), R2 MFC.
• VoIP protocols: SIP.
• Asterisk interface.
• Fax and modem: Fax over G.711, T.38.
• SFP form factor.

The use of this unique equipment solves several problems at once:

• Protocol incompatibility. TDM and IP networks use different protocols to carry voice traffic. The VoIP E1 gateway performs signal conversion between these protocols, allowing them to interoperate.
• Different transmission mediums. TDM networks traditionally use analog channels, while IP networks use digital channels. The VoIP E1 gateway provides interoperability between these transmission media, allowing you to use your existing TDM infrastructure to transport voice traffic over an IP network.
• Physical isolation. TDM and IP networks can be physically isolated from each other. The VoIP E1 gateway allows these networks to be connected to the same equipment, enabling physical integration.

Here are some specific examples of how a VoIP E1 gateway in the SFP form factor can help solve these problems:

• Organizations that have a TDM PBX and want to migrate to VoIP can use a VoIP E1 gateway to integrate their TDM PBX with an IP network. This will allow them to continue using their TDM PBX until they are ready to fully migrate to VoIP.
• Organizations that have TDM networks that need to be connected to the WAN can use a VoIP E1 gateway to convert the signals between TDM and IP networks. This will allow them to utilize their existing TDM infrastructure to carry voice traffic over the WAN.
• Organizations that have TDM and IP networks that need to be physically integrated can use a VoIP E1 gateway to connect these networks to the same equipment. This will allow them to manage these networks from the same location.

Overall, the VoIP E1 gateway in the SFP form factor is a valuable tool for integrating TDM and IP networks. It can help organizations solve several problems related to protocol incompatibility, different transmission environments, and physical isolation.

Configuring signaling of PSTN and SIP connection lines

Integration of the office PBX and IP network using the SIP protocol consists of the following steps:

1. Configuring the physical connection of the E1 interface.
2. Selecting and configuring the required TDM network signaling.
3. Configuring the SIP protocol.
4. Device reboot.

To configure the equipment you need to go to the "Settings" tab of the web-interface. The list of configurable parameters contains three sections — NETWORK, E1 PORT and DSS1.

Diagnostics and monitoring

The parameters of the "Diagnostics" subsection allow you to monitor the status of PCM channels (E1 interface), SIP channels and call statistics in real time.

For the purpose of network monitoring, the device is equipped with a built-in SNMP agent (SNMP v1/v2c), which transmits real-time alarm messages to the supervising SNMP manager. The SNMP agent also supports monitoring of the device states upon request from the SNMP manager, providing values and descriptions of variables in the corresponding MIB file.

Connecting an SFP VoIP E1 module through an Ethernet media converter

In some cases, when deploying an SFP VoIP E1 module to connect SIP-based communication systems and E1 devices, it is not possible to connect it to a local area network (LAN). In such situations, you can't do without using a budget media converter. This device is designed to convert the signal and further connect the fiber optic cable 1000BASE-SX with twisted pair 1000 Base-T.

Connected via Ethernet media converter SFP VoIP E1 module looks like this:

Maxnet has already successfully implemented the modules discussed above in its network. Thanks to this, business subscribers, most of whom have only E1 stream at their disposal, were able to connect the PBX to SIP telephony.