Denver-based telecommunications firm Qwest said Thursday that it has signed a multi-year agreement with a Chicago law firm. According to Qwest, it will provide data networking services to Sonneschein Nath & Rosenthal LLP, a law firm with offices in 13 U.S. states and Europe. Qwest said it is providing its iQ Networking services to Sonneschein as part of a data center relocation by the law firm. Financial impact of the deal was not disclosed. Qwest's data networking will be used for WAN connectivity.