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We perform the stationary phase analysis of the vertex amplitude for the EPRLspin foam model extended to include timelike tetrahedra. We analyse both,tetrahedra of signature $---$ (standard EPRL), as well as of signature $+--$(Hnybida-Conrady extension), in a unified fashion. However, we assume all facesto be of signature $--$. The stationary points of the extended model aredescribed again by $4$-simplices and the phase of the amplitude is equal to theRegge action. Interestingly, in addition to the Lorentzian and Euclideansectors there appear also split signature $4$-simplices.

Asymptotic analysis of the EPRL model with timelike tetrahedra