Bandwidth Management for VoIP Calling Through Asterisk

Initially Internet is used for data communication but now a day with the help of VoIP technology we are able to transmit voice and video streams over the internet. This paper describes IP-PBX server based on Asterisk. Asterisk is one of the first open source PBX software. Traditional EPABX system have many disadvantages over Internet Protocol Private Branch Exchange (IP-PBX). This paper contains brief introduction about SIP and IAX protocol along with its channel configuration in Asterisk. Bandwidth comparisons of SIP and IAX calls with two different codecs G.711 and GSM is done by online erlag’s B software.