A single judge bench of the Punjab and Haryana High Court held that,

At the same time, it cannot be ignored that acceptance of the CD in question shall amount to a clear breach of fundamental right of the petitioner-wife i.e., her right to privacy, as has been upheld in various judicial pronouncements. The Hon’ble Supreme Court in People’s Union for Civil Liberties Vs. Union of India, (1997)1 SCC 301, has observed as under:-

“18. The right to privacy- by itself- has not been identified under the Constitution. As a concept it may be too broad and moralistic to define it judicially. Whether right to privacy can be claimed or has been infringed in a given case would depend on the facts of the said case. But the right to hold a telephone conversation in the privacy of one’s home or office without interference can certainly be claimed as “right to privacy”. Conversations on the telephone are often of an intimate and confidential character. Telephone-conversation is a part of modern man’s life. It is considered so important that more and more people are carrying mobile telephone instruments in their pockets. Telephone conversation is an important facet of a man’s private life. Right to privacy would certainly include telephone-conversation in the privacy of one’s home or office. Telephone-tapping would, thus, infract Article 21 of the Constitution of India unless it is permitted under the procedure established by law.”

Thus, recording of telephonic conversation of the wife without her knowledge, is a clear cut infringement of her privacy.

Citations:

Other Sources:

https://indiankanoon.org/doc/195720592/

https://www.casemine.com/judgement/in/635a65aef364724175a72b6e

This decision is appealed at Apex Court here.