Mourner : Comforting over phone

Igros Moshe (OC Iv #40.11) Question: Can the mitzva of comforting a mourner be done with a telephone call? Answer The mitzva has two components. 1) Helping the living mourner who is deeply suffering by saying words that comfort him. In order to do that one is obligated to go to the house of the mourner where he is. 2) Helping the deceased as is decribed in Shabbos (152b).  Therefore the Rambam says that the mitzva of comforting mourners takes precedence over visiting the sick since it is providing kindness to  the living and the dead.  It seems to me that the first component can be accomplished with a telephone call while the second component can be done only by going to the house of mourning. Or the place of the deceased. However it is definitely better to comfort the mourner in person which gives honor to the mourner. In conclusion if it is possible he should go in person to the house of the mourner in oder to do the mitzva in the best manner. And not rely on a telephone call.  However if he can’t go for example if he is sick or involved in a different mitzva than he can at least utilize the phone. This is what I wrote concerning visiting the sick . It is permitted for the mourner to speak on the telephone for what he needs and thus there is no problem calling and speaking to him on the telephone.