code: public PutVoiceConnectorTerminationCredentialsRequest withCredentials(Credential... credentials) {
          if (this.credentials == null) {
              setCredentials(new java.util.ArrayList<Credential>(credentials.length));
          }
          for (Credential ele : credentials) {
              this.credentials.add(ele);
          }
          return this;
      }
docs: <p>
  The termination SIP credentials.
  </p>
  <p>
  <b>NOTE:</b> This method appends the values to the existing list (if any). Use
  {@link #setCredentials(java.util.Collection)} or {@link #withCredentials(java.util.Collection)} if you want to
  override the existing values.
  </p>
  
  @param credentials
  The termination SIP credentials.
  @return Returns a reference to this object so that method calls can be chained together.