In Iliad 7, whose idea is it to call a truce and have Hector challenge an Achaean to a duel and why is the duel suggested?

Iliad 7 opens with Paris/Alexander
returning to the battle alongside Hector. In Iliad 3, the duel
between Menelaus and Paris had been unable to bring an end to the war, so in
Iliad 7 another attempt is made to bring the fighting to an end.
With this duel, however, it appears that only the fighting for that day will come to an
end. Thus, Apollo says,

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it would be best by far to end this
day of strife and conflict. Let them fight another
day with Ilium at issue... (A.S. Kline
translation)

In
Iliad 7, Athena, who favors the Greeks, and Apollo, who favors the
Trojans, decide to inspire Hector to challenge on the Greeks to a duel similar to the
one fought by Paris and Menelaus in Iliad
3.

This divine inspiration is transmitted to the
mind of the Trojan Helenus, who "divined in his mind this plan, in which the immortals
had concurred" (A.S. Kline translation). Helenus relays this plan to Hector, who is
happy to issue the challenge since Helenus also tells him that the gods have declared
that "it is not your fate to die, your time has not yet
come."

Thus, Hector realizes that he could bring some end
to the fighting and he could also remain alive.