  We report on an analysis of X- and $\gamma$-ray observations of PKS 1830-211,
based on the long-term campaigns carried out by \emph{INTEGRAL} and COMPTEL.
The \emph{INTEGRAL} data currently available present a $33\sigma$ significance
detection in the 20-100 keV band, while the COMPTEL 6-years data provide a
$5.2\sigma$ significance detection in the 1-3 MeV energy band. At hard X-rays,
\emph{INTEGRAL} and supplementary \emph{SWIFT} observations show flux
variability on timescales of months. At $\gamma$-rays, the source shows
persistent emission over years. The hard X-ray spectrum is well represented by
a power-law model, with $\Gamma \sim 1.3$ in the 20-250 keV band. This photon
index is well consistent with the previous report of $\Gamma \sim 1.3$ obtained
at $E > 3.5$ keV from the best fit of \emph{XMM-Newton} data with a broken
power law model. The joint \emph{XMM-Newton}/\emph{INTEGRAL} spectrum presented
here is then fit with a broken power-law model and the parameters are refined
compared to the previous. The results show the photon index changes from $\sim
1.0$ to $\sim 1.3$ at a break energy $\sim 4$ keV. At MeV energies, the
spectrum softens to $\Gamma \sim 2.2$. These results, together with the EGRET
measurement at $E \ge 100$ MeV, constitute a broad-band spectrum containing the
peak of the power output at MeV energies, similar to most high-luminosity
$\gamma$-ray blazars. The measured spectral characterstics are then discussed
in the framework of the gravitational lens effects.

Astrophysics