The 3131 relies on SS7 signaling managed on the switch side by the historical operator. The service intercepts the CLI (Calling Line Identification) of the last caller and vocalizes it. On unbundled lines (Free, SFR in VoIP), the 3131 is re-emulated by the alternative operator’s softswitch, which explains the recurring malfunctions reported on forums: busy messages, absence of number retrieval, incompatibility with certain Freebox or Livebox configurations in router mode.
CLIP Signaling and SIP Logs: What the 3131 Does Not Do
The 3131 retains only one number, the last one. It does not provide timestamps, history, or distinction between intentionally hung up calls and unanswered calls. On a traditional analog line (RTC), the CLIP function (number presentation) depends on the service being activated by the operator and the compatibility of the device.
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On a VoIP line passing through a box, the situation differs. The SIP protocol generates headers containing the P-Asserted-Identity field, which carries the calling number authenticated by the network. Recent boxes utilize this field to feed a call log accessible from the box’s web interface (typically at 192.168.1.1 or equivalent). This log retains several dozen entries with date, time, and duration.
We recommend checking in the box’s administration interface that the call log function is indeed activated. On Freebox, it is found in the Telephony tab. On Livebox, in the Phone section. This log makes the 3131 technically redundant for any subscriber with internet access.
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To find out precisely which number replaces the 3131 depending on your operator and type of line, the answer depends on the underlying protocol and the software layer of your box.
Call Forwarding to Voicemail and Notification via SMS or Email
The voicemail remains the primary functional alternative to the 3131, provided that call forwarding is configured correctly. Each operator offers forwarding on no answer (network code *61*), on busy (*67*), and unconditional (*21*). The destination number is that of the operator’s voicemail or an external number.
The difference with the 3131 is structural: the voicemail captures the voice message and triggers a notification. Orange, SFR, and Free send an SMS to the mobile associated with the landline or an email containing the calling number and the time of the message. This mechanism transforms a passive missed call into an active alert.
- Forwarding on no answer (*61*): triggers after a configurable number of rings, generally four to six
- Forwarding on busy (*67*): useful on lines without call waiting or when VoIP only manages one simultaneous channel
- Email notification from voicemail: activatable in the client area of each operator, with audio attachment in MP3 or WAV format
On SFR VoIP lines, the 3131 is sometimes inaccessible (message “too many calls”). Forwarding to the SFR voicemail and then consulting via 147 or the client area circumvents this limitation.
Mobile Applications and CRM Integration for Professionals
For individuals equipped with a smartphone, operator applications (Orange Phone, SFR and Me, Free Mobile) natively display the log of missed calls on the landline associated with the account. The missed call on the landline appears in the mobile’s timeline, with identification of the number via integrated directory databases.
The case of small and medium-sized enterprises (SMEs) deserves separate treatment. Players like Dexem offer automatic email sending to sales teams for each missed call, with the insertion of variables: calling number, date, reason, assigned advisor. This approach structures the flow of information and avoids reliance on a basic voice service.
Integration with a CRM transforms the missed call into a callback task. The number is automatically associated with a client file, a contact history is created, and the callback can be routed to the right person. This level of processing is incomparable to the 3131, which merely returns a raw number without context.
Criteria for Choosing a Missed Call Tracking Solution in a Professional Context
- Volume of incoming calls: below ten per day, the box log or operator application suffices
- Need for traceability: if every missed call must be documented (regulatory obligation, customer relationship), a dedicated tool with timestamping and export is necessary
- Multi-user: solutions like Dexem or virtual standards allow assigning missed calls to different employees according to routing rules
- Cost: box logs and operator applications are included in the subscription, while professional solutions charge a monthly fee per line or per user
Law 2025 on Telemarketing: Impact on Missed Calls
Law No. 2025-594 of June 30, 2025, modifies the context of use for missed call reporting solutions. It prohibits telemarketing in the sectors of energy renovation, renewable energy production, and housing adaptation, even with consumer consent (except for ongoing contracts).
The volume of unsolicited calls related to insulation or photovoltaics will mechanically decrease. The remaining missed calls therefore more often come from legitimate contacts: clients, relatives, administrations. This evolution enhances the importance of precise tracking of missed calls, as the likelihood that an unanswered call is relevant increases.
For professionals who received a significant volume of prospecting calls, the reduction of noise simplifies sorting. A call log filtered by known or unknown numbers, coupled with a reverse directory, becomes a time management tool rather than just a substitute for the 3131.
The replacement of the 3131 is not a matter of an alternative number to dial. It is a change of technical layer: moving from a single-entry voice service to an ecosystem of notifications, structured logs, and, for professionals, automation of callbacks. The network signaling brick still exists, but it is now consulted on a screen, not over the phone.