There's no-one at your company who even knows how to approach this?
Let's be honest here, Anisha. To tell you anything useful, I would need to actually read OpenGTS's documentation. Which I won't do because you're being paid to do so and I'm not.
The parts I did skim (couldn't help myself) make it look like OpenGTS is
the server-side website.
If you really do need expertise for this job that your company doesn't have, you can use our job board to get it.
So, does it mean that this software's webpage needs to be integrated in the client/server(?) website? Please guide.
You use an IFrame
on the client website. At least, that's what that excerpt sounds like.