Answering the telephone whilst praying

They were praying one of the prayers at home when the telephone
started to ring, and it distracted them with its ringing for a long
time. Is it permissible in such cases for the worshipper to take a few
steps forwards or backwards and pick up the receiver and say "Allaahu
akbar" or raise his voice in recitation so that the caller will know
that he is praying – by analogy with(the hadeeth with speaks of)
opening the door to one who knocks or raisinghis voice so that he can
hear you?
Praise be to Allaah.
If the worshipper is in the position that you describeand the phone
starts ringing, it is permissible for him to lift the receiver,even if
he has to move a little way forward or back,or to the right or left,
on the condition that he keeps facing the qiblah and he says 'Subhaan
Allaah' so that the person who is calling will know (that he is
praying). It wasnarrated in al-Saheehayn that the Messenger of Allaah
(peace and blessings of Allaah be upon him) used to pray whilst
carrying his granddaughter Umaamah.When he did rukoo', he would put
her down, and when he stood up he would pick her up again. According
to a report in Muslim, this was when he was leading the people in
prayer in the mosque. (Narrated by Maalik, 1/170; al-Bukhaari,
1/487,in Sutrat al-Musalli, Baab idha hamala jaariyatan sagheeratan
'ala 'unuqihi; Muslim, 543, in al-Masaajid, Baab jawaaz Hamal
al-Subyaan; Abu Dawood, no. 917-920; al-Nasaa'i, 2/45).
Ahmad and others narrated that 'Aa'ishah (may Allaah be pleased with
her) said: "The Messenger of Allaah (peace and blessings of Allaah be
upon him) was praying in his house with the door closed. I came (to
the door) and he walked over and opened the door for me, then he went
back to his place." She mentioned that the door was in the direction
of the Qiblah. (Narrated by Ahmad, 6/31; Abu Dawood, 922; al-Nasaa'i,
1/178; al-Tirmidhi, 2/497).
Al-Bukhaari and Muslim narrated that the Messenger of Allaah (peace
and blessings of Allaah be upon him) said: "Whoever notices something
alarming whilst praying, then men should say 'Subhaan Allaah' and
women should clap their hands."
And Allaah is the Source of strength. May Allaah bless our Prophet
Muhammad and his family and companions, and grant them peace.