Don't worry . Mere a contact or phone call never leads to take a case against you. But you may caught in red hand by the police,then they can file a case against you. If you want to know more please read the following words and it may help you for queering your doubts .
“The Immoral Trafficking Prevention Act, 1956 , the main statute dealing with sex-work in India, does not criminalize prostitution or prostitutes per se, but mostly punishes acts by third parties facilitating prostitution like brothel keeping, living off earnings and procuring, even where sex-work is not coerced.”
Section 5 in The Immoral Traffic (Prevention) Act, 1956 deals that
Procuring, inducing or taking 1[person] for the sake of prostitution.—
(1) Any person who— (a) procures or attempts to procure a [person], whether with or without [his] consent, for the purpose of prostitution; or 1[person], whether with or without [his] consent, for the purpose of prostitution; or"
(b) induces a 23 [person] to go from any place, with the intent that [he] may for the purpose of prostitution become the inmate of, or frequent, a brothel; or 1[person] to go from any place, with the intent that 3[he] may for the purpose of prostitution become the inmate of, or frequent, a brothel; or"
(c) takes or attempts to take a 23 [person], or causes a 23 [person] to be taken, from one place to another with a view to 24 [his] carrying on, or being brought up to carry on prostitution; or
(d) causes or induces a [person] to carry on prostitution,1[person] to carry on prostitution," [shall be punishable on conviction with rigorous imprisonment for a term of not less than three years and not more than seven years and also with fine which may extend to two thousand rupees, and if any offence under this sub-section is committed against the will of any person, the punishment of imprisonment for a term of seven years shall extend to imprisonment for a term of fourteen years: Provided that if the person in respect of whom an offence committed under this sub-section,—
(i) is a child, the punishment provided under this sub-section shall extend to rigorous imprisonment for a term of not less than seven years but may extend to life; and
(ii) is a minor, the punishment provided under this sub-section shall extend to rigorous imprisonment for a term of not less than seven years and not more than fourteen years;]
(3) An offence under this section shall be triable—
(a) in the place from which a [person] is procured, induced to go, taken or caused to be taken or from which an attempt to procure or take such [person] is made; or 1[person] is procured, induced to go, taken or caused to be taken or from which an attempt to procure or take such [person] is made; or"
(b) in the place to which he may have gone as a result of the inducement or to which he is taken or caused to be taken or an attempt to take him is made.
Section 372 and 373 of IPC also dealing with prostitution
372. Selling minor for purposes of prostitution, etc.—Whoever sells, lets to hire, or otherwise disposes of any 1[person under the age of eighteen years with intent that such person shall at any age be employed or used for the purpose of prostitution or illicit intercourse with any person or for any unlawful and immoral purpose, or knowing it to be likely that such person will at any age be] employed or used for any such purpose, shall be punished with imprisonment of either description for a term which may extend to ten years, and shall be liable to fine. 2[Explanation I.—When a female under the age of eighteen years is sold, let for hire, or otherwise disposed of to a prostitute or to any person who keeps or manages a brothel, the person so disposing of such female shall, until the contrary is proved, be presumed to have disposed of her with the intent that she shall be used for the purpose of prostitution. Explanation II.—For the purposes of this section “illicit intercourse” means sexual intercourse between persons not united by marriage or by any union or tie which, though not amounting to a marriage, is recognised by the personal law or custom of the community to which they belong or, where they belong to different communities, of both such communities, as constituting between them a quasi-marital relation.]
373. Buying minor for purposes of prostitution, etc.—Whoever buys, hires or otherwise obtains possession of any 1[person under the age of eighteen years with intent that such person shall at any age be employed or used for the purpose of prostitution or illicit intercourse with any person or for any unlawful and immoral purpose, of knowing it to be likely that such person will at any age be] employed or used for any purpose, shall be punished with imprisonment of either description for a term which may extend to ten years, and shall also be liable to fine. 2[Explanation I.—Any prostitute or any person keeping or managing a brothel, who buys, hires or otherwise obtains possession of a female under the age of eighteen years shall, until the contrary is proved, be presumed to have obtained possession of such female with the intent that she shall be used for the purpose of prostitution. Explanation II.—“Illicit intercourse” has the same meaning as in section 372.]