Data cross-domain searching method

The invention relates to hierarchical deployment SIP (Session Initiation Protocol) server system, in particular to a method of searching data crossing domain in system. The invention discloses a data cross-domain searching method aiming at the default that the data searching method in the prior art is easy to form circulation and unlimited extension. The technical proposal of the invention is that: the local server starts multithreading and sends searching request to the adjacent server, and sets transmitting jumping figure and records the transmitting route; the server received the searchingrequest executes local searching and transmits and searches other servers, and returns to the local searching result and the searching result other server returned. The transmission has maximum jumping figure TTL limitation; each time the jumping figure reduces 1, and the transmitting route is recorded in the searching request before transmitting. The invention is suitable for hierarchical deployment SIP server system to search data.