On account of longer voice signal delays caused by the system in the IP network, voice quality will be impaired by echo unless this is removed prior to transmission. The HG 3500 and HG 3575 modules therefore feature an integrated echo canceler.

Lower bandwidth requirements

If voice is transmitted via IP in uncompressed form (pursuant to G.711), the bandwidth requirement is greater than in the case of ISDN on account of the packaging in the IP protocol.

If less bandwidth is to be occupied, the voice signal can be compressed. HG 3500 and HG 3575 offer optional compression pursuant to the G.729A standard (only 8 Kbps, instead of 64). Furthermore, additional bandwidth can be saved by suppressing voice pauses. Silence suppression suppresses the transmission of silence on the line. (G.729AB, or G.711 Annex 2)

OpenScape 4000 IP distributed architecture supports prioritization in the IP network on the basis of the following standards:

HG 3500 and HG 3575 can transmit up to 120 B channels simultaneously over the IP network regardless of the hardware and configuration in use (see "Gateways HG 3500 and HG 3575, Section 2.6, “B Channels”).

HG 3500 and HG 3575 support network management on the basis of the SNMP protocol. Statistical data from the applicable standard MIBs and additional data from proprietary MIBs can be queried.