Code of Professional Responsibility and Accountability (CPRA)
Section 24. Encroaching or interfering in another lawyer's engagement; exception. - A lawyer shall not, directly or indirectly, encroach upon or interfere in the professional engagement of another lawyer. This includes a lawyer's attempt to communicate, negotiate, or deal with the person represented by another lawyer on any matter,
whether pending or not in any court, tribunal, body, or agency, unless when initiated by the client or with the knowledge of the latter's lawyer. A lawyer, however, may give proper advice and assistance to anyone seeking relief against perceived unfaithful or neglectful counsel based on the Code.