7. A method comprising: (a) receiving a list of one or more identifiers at a thread of an interactive voice response system, (i) wherein each of said identifiers is associated with one of a plurality of content streams, (ii) wherein each of said content streams has one or more of a plurality of media types, (iii) wherein said list specifies a playback order for said content streams, and (iv) wherein said thread is associated with one of said media types T and with a call that involves said interactive voice response system and a telecommunications terminal; and (b) executing in said thread a command for initiating delivery of one of said content streams S to said telecommunications terminal, (i) wherein said content stream S has said media type T, (ii) wherein the time τ at which delivery of said content stream S begins is based on said playback order, and (iii) wherein said thread also receives an attribute value V that is associated with another one of said content streams R, and wherein said time τ is also based on said attribute value V.
7. A method comprising: (a) receiving a list of one or more identifiers at a thread of an interactive voice response system, (i) wherein each of said identifiers is associated with one of a plurality of content streams, (ii) wherein each of said content streams has one or more of a plurality of media types, (iii) wherein said list specifies a playback order for said content streams, and (iv) wherein said thread is associated with one of said media types T and with a call that involves said interactive voice response system and a telecommunications terminal; and (b) executing in said thread a command for initiating delivery of one of said content streams S to said telecommunications terminal, (i) wherein said content stream S has said media type T, (ii) wherein the time τ at which delivery of said content stream S begins is based on said playback order, and (iii) wherein said thread also receives an attribute value V that is associated with another one of said content streams R, and wherein said time τ is also based on said attribute value V. 8. The method of claim 7 wherein said content stream R has a media type different than said media type T.