Telephone call recording -- is it an evidence in a court of law ?

Yes you can produce the call recordings as secondary evidence by observing the procedures as prescribed in the Indian Evidence Act. 

In India, call recordings can be admissible as evidence in court, but certain conditions must be met: 1. _Authenticity_: The recording must be authentic and not tampered with. 2. _Reliability_: The recording must be reliable and of good quality. 3. _Relevance_: The recording must be relevant to the case. 4. _Procedure_: The recording must be obtained through legal means, such as: a. _Consent_: Both parties must consent to the recording. b. _Legal intercept_: The recording must be made under legal authority, like a police investigation. 1. _Certification_: The recording must be certified by the person who made the recording, stating: a. _Date and time_ b. _Location_ c. _Identity of speakers_ d. _Device used_ 1. _Verification_: The recording must be verified by a forensic expert or a witness. The admissibility of call recordings as evidence is governed by the Indian Evidence Act, 1872, and the Information Technology Act, 2000. Courts have accepted call recordings as evidence in various cases, but the above conditions must be fulfilled. Please consult a legal expert for specific guidance on using call recordings as evidence in a court of law.

Yes,call/tape  recording is admissible in evidence subject to fulfillment of  requirements of Evidence Law.