User guide

Telephony and Multimedia Services

1/1551-HSC 901 35/3 Uen C 2005-12-02

Figure 51 Base band Solution with External ISDN Filter

8.2 Telephony over IP

Telephony over IP (ToIP) is a Voice over IP (VoIP) based application,

intended to supplement or replace traditional POTS. The function and

quality as perceived by the subscribers, is identical to traditional POTS.

Charging is performed entirely in the local exchange. Consequently the

same charging and billing systems can be used independently of the

subscriber connection method, base band POTS or ToIP.

The Telephony over IP deployment is simple to implement, and gives the

full advantage of the EDA System. There is no need to consider existing

equipment (such as existing local exchange), and there is no need for a

technician to work at the customer premises, since no installation of splitter

and filters is required. This solution is especially advantageous in new

subscriber installation, since half of the MDF (equipment part) is not

needed. Subscriber aggregation is done in an Ethernet, eliminating the

need for a PSTN line per subscriber

Telephony over IP is implemented by combining the ETSI TIPHON

architecture of H.323 VoIP with the ETSI Access Network architecture,

using the V5.2 protocol standard, see Figure 52 on page 74.