The next generation communication system will provide high quality multimedia service in a more flexible and intelligent manner. As the extension of next generation network?s last one mile, multi-hop wireless ad hoc networks have attracted more research attention. In terms of the limited bandwidth, flexible mobility, the deployment of infrastructure-less, ad hoc networks are suffering from the lack of supporting real-time multimedia service in despite of active research over a decade. In this paper, we proposed a method, which replanted SIP and MPLS technology to wireless ad hoc networks. In the paper, we focus on three problems: SIP services discovery in ad hoc networks, SIP message routing, and label distributing. Simulation shows that our approach performed better in wireless ad hoc networks.