Is it obligatory to raise the hands during supplication?

Question:
Regarding supplication, is it obligatory to raise the hands between the adhan and the iqamah, or does one simply supplicate to Allah ?

Answer:
Raising the hands is among the causes of supplication being answered, but in the places where the Prophet (peace and blessings be upon him) did not raise them, one does not raise them. He did not raise them after performing the obligatory prayers, nor in the Friday sermon, nor in the sermon for the festival. However, in the prayer for rain, he used to raise his hands, or in the Friday sermon if he was asking for rain, he would raise his hands, and so on in other of his supplications. As for the obligatory prayers, he did not raise them when he concluded them with the taslim, nor between the two prostrations, nor at the end of the tashahhud; he did not raise them, peace and blessings be upon him.