Is In vitro fertilisation (ivf) halal in Islam

Is InVitro fertilisation (ivf) halal in Islam?
Is IVF or test-tube baby permissible, when the sperm and the egg belong to a lawfully wedded couple?”
There is no objection to carrying out the procedure in itself. However, it is obligatory to keep away from any preliminary step that might involve committing a ḥarām act like prohibited looking and touching.
Assuming it is permissible; can the couple go ahead with the procedure if a non-maḥram doctor carries it out? And does the born child belong to the same couple?
The child born by way of this procedure belongs to the couple from whom the sperm and the egg were taken.

Assuming that it is not permissible in itself; would the ruling be different if the continuity of the marriage was dependent on it?
It is mentioned that carrying out the procedure, in itself, is permissible.