2002 - cesnet

connection and compare the features with the existing Cisco solution. The connectionwas functional, with very good quality of two parallel calls; however, itis not suitable for application in CESNET2 at present. A number of call codecs,series CELP, are not supported; the used ISDN/BRI card made by AVM did notsupport the DDi prefix but only MSN numbers. The researchers have been furthermonitoring the development of VoGW solutions for Linux.Towards the end of 2002, we found an IP phone LAN Phone 101, available fora very reasonable price (EUR 150), which appears after initial testing to besuitable for wide use in the IP telephony network. It is produced by Welltech(Taiwan). The set can also be used as an analogue phone, which increases theefficiency of the investment. The phone includes a 10/100BASE-T switch forPC connection. We also found the range of supporting codecs to be surprising(G.711 a/µlaw, G.723.1, G.729, G.729a).Figure 8.4: LAN Phone 101 – both IP and analogue phoneWe have already successfully tested three types of H.323 IP phones:• optiPoint 300 Advance• optiPoint 400 Standard• LAN Phone 101At present, we are trying to solve the method of authentication, concerning thelogging of IP phones in CESNET2 using the H.235 standard.8.4 IP Telephony Cookbook ProjectDuring the second half of 2002, we joined the international project titled IPTelephony Cookbook, organised by Terena. The objective of the project is toHigh-speed National Research Network and its New Applications 2002113