Some embodiments provide a non-transitory machine-readable medium stores a program. The program interacts, through a first page of a web browser application, with an application hosted on a first domain. The program further establishes, through a second page embedded in the first page, a bidirectional communication channel with a service instance hosted on a second domain. The service instance is configured to facilitate communication for a collaboration session between the computing device and a set of computing devices interacting with the application. The program also receives data for the collaboration session through the first page of the web browser application. The program further transmits the data through the bidirectional communication channel by sending the data from the first page to the second page and forwarding the data to the service instance.