The call comes at the moment of arrest
In criminal defence, the phone rings when someone has just been arrested or detained, and it is often not the person who calls: it is a mother, a partner, a friend, at night or on the weekend. The next call comes with a document in hand — an appearance notice, a summons, release conditions — and a court date coming up.
In Quebec, a person who is arrested or detained can speak to a lawyer at legal aid's emergency service, 24 hours a day, free whatever their income; if they do not have the number, police must give it to them or dial it for them (Éducaloi). By default, your receptionist gives that line first to the person in custody or their relative; in another province, you enter the legal aid or duty counsel line that applies. If your firm takes on-call work itself, you say so in your instructions: the alert then goes to your lawyer on call, and the referral stays a fallback.
She says nothing about what to say or not say to the police, takes no view on chances or sentence, and calculates no deadline. She asks whether it is safe to text or leave a message, takes the complainant's and any co-accused's names before the story, for your conflict check, and records the court date and courthouse exactly as written.