ISDN PRI to SIP Gateway

VoIP Gateway for migration of TDM network into NGN and IMS

  • up to 16 E1 interfaces
  • up to 480 VoIP channels
  • SS7, ISDN PRI, V5.2, R2 CAS, R2 MFC, R 1.5
  • SIP, RTP, RTCP, TCP, UDP
  • voice codecs G.711, G.723.1, G.726, G.729a/b, GSM
  • registration and authentication – up to 5000 SIP-subscribers
  • fax over G.711, T.38 fax relay
  • Echo Cancellation
  • SNMP alarm trap
  • SyncE (option)
  • Single/Dual-redundant 220 VAC or 48/60 VDC Input

SIP to ISDN PRI Gateway (ISDN PRI VoIP gateway) is used in different options of conjugation of VoIP and TDM/PSTN networks for minimization of expenses and reduction of operational costs. Support of all types of signaling being used on the PSTN network allows using the equipment for reconstruction and upgrade of all types of automatic telephone exchange used on a network.
Effective integration TDM to NGN and IMS networks.
Possible Titles ISDN PRI Signaling – Euro ISDN, E-DSS1, simply EDSS1.

ISDN PRI to SIP Media Gateway, integration to IP, SIP trunk, E1 stream, tdm switch over ip

Pic 1. ISDN PRI to SIP Gateway Connection Block Diagram.

ISDN PRI to SIP Gateway supports the following signaling protocols:

  • SS7 (or Signaling System #7, CCS7 Common Channel Signaling System 7, C7, CCITT7, N7, Signalisierungssystem Nummer 7)
  • ISDN PRI (or Euro-ISDN, E-DSS1, simply EDSS1)
  • V5.2
  • V5.1
  • R2 CAS
  • R2 MFC
  • R2 DTMF

IP-PBX supporting value added services

This functionality allows to use the gateway as IP-PBX that can register up to 1000 SIP subscribers and provide them with value added services. In addition the gateway software allows to “display” TDM network subscribers (for example, subscribers of remote exchange capacities connected to the gateway over ISDN PRI with SIP accounts of VoIP network with assigned authentication parameters.

Distinctive features

  • Support all types of alarm system being used on TDM/PSTN network
  • Possibility of implementation of IP-TDM, TDM-IP and TDM-TDM connections

ISDN PRI to SIP Gateway

Option 1 is used when it is required to replace the TDM Switch with the SoftSwitch. If multiple subscriber nodes are connected to the TDM Switch over the DSS1 (Digital Subscriber System No. 1) interface they can be switched to the SoftSwitch using the gateway as indicated on the following figure.

In this case the DSS1 interface disconnects from the TDM Switch and connects to the gateway that is connected to the SoftSwitch via the SIP data communications network.

ISDN PRI to SIP Media Gateway, integration to IP, SS7, V5.2, codecs G.711, G.723, G.726, G.729, T.38

Pic 2. ISDN PRI to SIP Interconnection Diagram

SIP to ISDN PRI Gateway

Option 2 is used when it is required to connect VoIP subscribers from the local network to the PSTN number capacity. If the operator has the existing TDM Switch with free ISDN PRI interfaces the gateway on the TDM network side looks as the DSS1 subscriber node while on the IP network side it looks as the IP Telephone Exchange where IP subscribers register (please see the figure).

SIP to ISDN PRI Media Gateway, SIP trunk, integration to IP, SS7, V5.2, G.711, G.723, G.726, G.729

Pic 3. SIP to ISDN PRI Interconnection Diagram