(REUTERS) -- AT&T Inc and China Telecom said they had agreed to expand their relationship in China and the United States and look into supporting each other in other regions.

The companies said they would expand AT&T's services for business customers in China and consider jointly developing services, including video conferencing and managed hosting.

AT&T and China Telecom have worked together since 2000, when they formed a joint venture, Shanghai Symphony Telecommunications Co.

(Reporting by Sinead Carew in New York; editing by Lisa Von Ahn)