Ask HN: What data-integration platforms and technologies do Telcoms use?

I'm looking into data-integration and data-warehousing for telecom service providers. My questions are: What data-integration/business intelligence solutions or products (Informatica, Oracle Data-Integrator, Ab Initio, SQL SIS, Pentaho Data-Integration) are most prevalent in, top-tier to mid-tier, Telecom service providers (AT&T, Verizon, Sprint, Rogers, Orange)? What data-warehousing solutions and platforms (IBM InfoSphere, Oracle Database, SAP BW) are most prevalent in, top-tier to mid-tier, Telecom service providers (AT&T, Verizon, Sprint, Rogers, Orange)? What are the advantages of each of the data-integration platforms? What are the disadvantages of each of the data-integration platforms? What programming languages are the data-integration products primary written in? How much does each data-integration platform typically cost and what is their pricing model? What are the advantages of each of the data-warehousing platforms? What are the disadvantages of each of the data-warehousing platforms? What programming languages are the data-warehousing products primary written in? How much does each data-warehousing platform typically cost and what is their pricing model? If anyone can answer even one of these I'd be eternally grateful, I'm not having much luck looking through Gartner/Forrester or Google.