With dynamic integrated service, phones get the priority to ensure high quality voice traffic, but when the phones are not in use, the bandwidth is returned to the data side in real time. As an example, with a full dynamic integrated DS1, 1540 k (t1 bandwidth) is assigned to the data side. If one phone is being used, then subtract 64 K (varies) from the 1540 k, if two phones are being used, subtract 128 k, and so on. When the user hangs up the phone that bandwidth is automatically returned to the data side. With dynamic integrated, you will always have 1.54 mbps (megabits per second) when phones are not in use.
Channelized DS1, more commonly referred to as integrated T1, is a DS1 (T1) line comprised of 24 (64Kbps each) autonomous channels. Each of these independent channels can support different applications simultaneously. For example, one channelized DS1 line, depending on availability in your area, can bundle any combination of the following applications: local telephone service, long distance, incoming toll free, internet, fax, and/or VoIP. Channelized DS1 is very popular with small and medium sized businesses which both access the internet and use 4 or more phone lines.