OS/DA. OS/DA is defined as: (a) any automatic or live assistance to a consumer to arrange for billing or completion, or both, of a telephone call (OS); and (b) a service that allows subscribers to retrieve telephone numbers of other subscribers (DA). In accordance with Rule 51.319(f), GTE will not provide OS/DA as a UNE when it offers customized routing. Where Gulf Coast provides its own OS/DA platform, Gulf Coast is required to route its OS/DA traffic to its platform over customized routing. Upon request, GTE will provide Gulf Coast a list of switches that can provide customized routing using line class codes or similar method (regardless of current capacity limitations). Gulf Coast will return a list of these switches ranked in priority order. GTE will return to Gulf Coast a schedule for customized routing in the switches with existing capabilities and capacity. In response to the written request from Gulf Coast, GTE will provide Gulf Coast with applicable charges, and terms and conditions, for providing OS and DA, branding, and customized routing. Subject to the above provisions, GTE will choose the method of implementing customized routing of OS/DA calls. When GTE offers customized routing to Gulf Coast, Gulf Coast will be responsible for the transport to route OS/DA traffic to the designated platform. If a dedicated transport UNE is used to route OS/DA traffic to the designated platform, Gulf Coast must purchase a trunk side port and establish a collocation arrangement in accordance with the Collocation Attachment. If the dedicated transport UNE used to route OS/DA traffic to the designated platform is ordered out of the applicable access tariff, no collocation arrangement or trunk side port is required.
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Sources: Interconnection Agreement, Interconnection Agreement