42 Chapter 6 IP telephone overviewNN40020-309NN40020-309• Scalability. A future-proof, flexible, and safe solution, combined with high reliability, allowsyour company to focus on customer needs, not network problems. Nortel internet telephonysolutions offer hybrid environments that leverage existing investments in Meridian and Norstarsystems.• Increased customer satisfaction. Breakthrough e-business applications help deliver thetop-flight customer service that leads to success. By providing your customers with rapidaccess to sales and support personnel via telephone, the Web, and e-mail, your business canprovide better customer service than ever before.IP telephones and VoIP trunksThis section describes two similar applications for IP telephony on the BCM50 2.0 system: IPtelephones and VoIP trunks. These applications can be used separately or together as a networkvoice/data solution.Refer to the information under the following headings:• "IP telephones"• "VoIP trunks"IP telephonesIP telephones offer the functionality of regular telephones, but do not require a hardwireconnection to the BCM50 2.0. Instead, they must be plugged into an IP network which isconnected to the through the integrated interface (LAN card) on the BCM50 2.0.Calls made from IP telephones through the BCM50 2.0 can pass over VoIP trunks or across PublicSwitched Telephone Network (PSTN) lines.Nortel provides two types of IP telephones. The IP telephones are wired to the IP network usingEthernet, in the case of the IP Phone series of telephones, or are accessed through your desktop orlaptop computer, as in the case of the IP Software Phone 2050.VoIP trunksVoIP trunks allow voice signals to travel across IP networks. A gateway within the BCM50 2.0converts the voice signal into IP packets, which are then transmitted through the IP network to agateway on the remote system. The device at the other end reassembles the packets into a voicesignal. H.323 trunks support private networking between BCM50 2.0s. H.323 trunks can supportconnections to a number of different types of equipment, including the Meridian 1 (running IPT),Succession 1000/M, DMS100 switches, and SL100 switches, and trunk applications.Creating the IP telephony networkThe following explains the components of the BCM50 2.0 system and the devices it interoperatesto create a network.