* Q1 non-GAAP EPS $0.22 beats estimates by $0.06

* Q1 revenue beats estimates

* Maintains 2009 revenue outlook

* Shares up almost 13 pct after the bell (Adds outlook)

By S. John Tilak

BANGALORE, April 23 (Reuters) - Starent Networks (STAR.O: Quote, Profile, Research), which helps mobile operators deliver multimedia services to subscribers, posted a 32 percent rise in quarterly profit and lifted its earnings outlook for the year, driving its shares up almost 13 percent.

Starent, which counts Sprint-Nextel (S.N: Quote, Profile, Research) and Verizon Wireless among its biggest customers, said on a conference call that it expects a profit of 71 cents to 74 cents a share in 2009.

The company, whose infrastructure equipment is used by wireless carriers to offer video, multimedia messaging and voice-over-IP services, had previously projected earnings of 65 cents to 68 cents a share for the year.

Starent, however, stood by its revenue outlook of $315 million for the period.