A SOC monitors and investigates threats, an MSSP operates your security tools, and MDR detects and actively responds to attacks on your behalf. The three terms overlap in practice: an MSSP often delivers monitoring from its own SOC, and most MDR providers run a SOC to do the work. The useful questions are who owns the tooling, who staffs the analysts, and who has the authority to act when an attack happens at night. This guide explains each model, where they overlap, how co-managed arrangements work, and which one fits your size and situation.
01What is a SOC (Security Operations Center)?
A security operations center is the team, processes and technology that continuously monitor an organization's environment, investigate suspicious activity, and coordinate the response to incidents. The term describes a function. That function can be staffed by your own employees, by a provider, or by both. The technology layer usually includes a SIEM to collect and correlate logs, endpoint detection and response (EDR) on laptops and servers, and often SOAR to automate repeatable steps. The people layer includes analysts who triage alerts, investigators who dig into the ones that matter, incident responders, detection engineers who write and tune rules, and threat hunters who look for attacks that no rule caught. The process layer is what holds it together: severity definitions, runbooks, escalation paths and case records. An in-house SOC gives you the most control and the deepest business context. Your analysts know which service account normally runs jobs overnight and which executive travels often. The price is that you own everything: tool licenses, log storage, detection content, hiring, training, and shift coverage around the clock, including weekends, holidays and attrition. For many organizations, that staffing problem is the reason they start looking at the other two options.
02What is an MSSP (Managed Security Service Provider)?
An MSSP is a vendor that operates and monitors security controls on your behalf, such as firewalls, VPNs, intrusion prevention, email security, endpoint protection and log monitoring. Its value is breadth: one provider takes on the routine work of running many security technologies. A typical MSSP contract is defined by devices and service levels. The provider handles rule changes, policy updates, upgrades of the security devices, health monitoring and periodic reporting. Many MSSPs also offer security monitoring, and they usually deliver it from their own SOC, which is why the terms get mixed up. When people say an MSSP provides a SOC, they mean the MSSP's analysts watch your logs from a shared operations center. The traditional limit of MSSP monitoring is where it stops. The classic output is an alert or a ticket: the provider tells you that something looks wrong, with a severity and some context, and your team investigates, decides and acts. That model works when you have people ready to receive those escalations. It struggles when the escalation lands at night with an overstretched IT administrator who has neither the time nor the tooling to investigate. Many MSSPs now sell MDR alongside their traditional services, so read the scope of work. The contract tells you more than the label does.
03What is MDR (Managed Detection and Response)?
Managed detection and response is a service in which a provider detects threats in your environment, investigates them, and takes action to contain them on your behalf. The defining word is response. An MDR provider is judged on whether attacks are found and stopped, which makes the service outcome-focused where traditional monitoring is activity-focused. MDR usually starts from endpoint telemetry, collected through an EDR agent that the provider supplies or supports, and extends to identity, cloud, email and network data depending on the offering. Analysts triage and investigate alerts, hunt for activity that did not trigger an alert, and deliver confirmed incidents with a timeline, the affected assets and the actions already taken. Response is where MDR offerings vary the most. Some providers offer only guided response, meaning they tell you what to do and your team does it. Others take direct containment actions under pre-approved authority: isolating a host from the network, killing a malicious process, disabling a compromised account, revoking active sessions, or blocking a file hash or IP address. Full remediation, such as rebuilding systems, forensic investigation and restoring from backups, is usually outside standard MDR scope and falls under a separate incident response engagement. Before you sign, get the exact list of actions the provider may take without calling you first, and the list of actions that need your approval.
04What is the difference between MDR, SOC as a service and an MSSP?
An MSSP manages security tools and escalates alerts, SOC as a service gives you an outsourced monitoring team built around your logs, and MDR detects and contains threats for you. The clearest way to compare them is by who owns each part of the work. SOC as a service and MDR are the closest pair. SOC as a service is usually built on a SIEM that ingests logs from many sources, such as firewalls, servers, cloud platforms, identity providers and business applications, which makes it strong on breadth of visibility and on log retention requirements. MDR is usually built on EDR and similar sensors, which makes it deep on the endpoints and identities it covers and fast to act on them. Many providers now blend the two, so the dimensions below matter more than the product name.
- 01Tooling: an in-house SOC buys and runs its own stack; an MSSP operates devices you usually own; SOC as a service often runs on the provider's SIEM; MDR usually brings or standardizes on its own EDR.
- 02People: an in-house SOC means your hires and your shift rota; MSSP, SOC as a service and MDR all rely on the provider's shared analyst teams.
- 03Primary output: an MSSP delivers alerts, tickets, device changes and reports; SOC as a service delivers investigated alerts with escalation; MDR delivers confirmed incidents plus the containment already performed.
- 04Response authority: an in-house SOC has full authority; an MSSP usually notifies and escalates; SOC as a service varies by contract; MDR acts within pre-approved limits.
- 05Coverage: an MSSP is broad across many control types; SOC as a service is broad across log sources; MDR is deep on the telemetry it collects.
- 06Business context: highest in-house; for any provider, it is only as good as the asset lists, contacts and runbooks you hand over during onboarding.
05What is a co-managed SOC, and who is responsible for what?
A co-managed SOC splits detection and response work between your internal team and a provider, with both working from shared tooling and an agreed division of responsibilities. It suits organizations that have some security staff but cannot cover every hour or every skill. Common splits include the provider covering nights, weekends and holidays while your team handles business hours; the provider doing first-line triage while your team investigates and remediates; or your team owning the SIEM and detection content while the provider operates it. Another common pattern pairs MDR on endpoints with an internal team that handles identity, cloud and application issues. Co-managed models fail at the seams. Write down a responsibility matrix for each incident type, a response authority list that says which actions the provider can take alone and which need a named approver, and an escalation tree with a backup for every contact. Give provider accounts least privilege, enforce MFA on them, and log what they do. Agree up front who owns the detection rules, playbooks and log data if the contract ends. Whatever the model, legal obligations stay with you. Under CERT-In's April 2022 directions, service providers, intermediaries, data centers, body corporates and government organizations must report specified cyber incidents to CERT-In within 6 hours of noticing them, keep logs of their ICT systems for a rolling period of 180 days within Indian jurisdiction, and designate a Point of Contact. A provider can detect the incident and help draft the report, but the duty belongs to your organization. Your contract should state how quickly the provider notifies you and where your logs are stored.
06Which should you choose: MDR, SOC or MSSP?
Choose based on who will act on an alert at night and who has the context to fix the root cause. Company size is a useful proxy, but your existing team and your regulatory exposure matter more. Whichever model you shortlist, ask every provider the same questions: which data sources they ingest, who writes and tunes detections, what actions they will take without asking, how and how fast they notify you, what happens after containment, and what you keep if you leave. Comparable answers make proposals comparable. Use the guide below as a starting point.
- 01No dedicated security staff: choose MDR. You need someone who can isolate a compromised laptop or disable a hijacked account at any hour, and a small IT team cannot staff that.
- 02A small security or IT team working business hours: choose MDR or co-managed SOC as a service, and keep remediation, change control and business context in-house.
- 03Many firewalls, branches and security devices with a stretched network team: use an MSSP for device operation, paired with MDR or SOC as a service for detection and response.
- 04Regulated or log-heavy environments, such as banking, fintech, healthcare and government suppliers: SOC as a service on a SIEM gives broad log monitoring and retention, with response authority written into the contract.
- 05An existing in-house SOC drowning in alerts: tune it before replacing it. SOC optimization of detection rules, playbooks and escalation paths targets the noise directly, and a provider can add overnight or overflow coverage.
- 06Strict data sovereignty or classified environments: build or keep an in-house SOC, and bring in external analysts to work inside your tools if you need extra hands.
- 07An active incident right now: none of these models replaces incident response. Contain and investigate first, then choose ongoing monitoring.
07How Faltrox can help
Faltrox offers services that map to each model above. SOC as a Service provides around-the-clock monitoring of your logs and security telemetry by Faltrox analysts, with escalation paths agreed during onboarding. Managed Detection & Response (MDR) adds investigation and pre-approved containment for organizations that need a provider to contain threats as well as report them. Managed Security Services (MSSP) covers the day-to-day operation of firewalls, endpoint protection and other controls, including products Faltrox licenses and manages. For teams that already run their own SOC, SOC optimization reviews detection coverage, alert noise, playbooks and escalation so analysts spend their time on real incidents. A scoping call is the usual first step: we map what you already own, where response authority should sit, and which model fits.
