# Individual NAP Statistics
Network Access Point (NAP) statistics provide per-trunk visibility into your voice traffic. MaaS auto-discovers all enabled NAPs and monitors each one individually.
***
## Supported NAP Types
MaaS monitors all NAP types:
| NAP Type | Protocol | Notes |
| -------- | ---------------------------- | -------------------------------- |
| SIP | SIP over UDP/TCP/TLS | Includes registration monitoring |
| H248 RTP | H.248/MEGACO (IP media) | RTP port ranges |
| H248 TDM | H.248/MEGACO (TDM media) | Line services |
| ISUP | SS7 ISUP | CIC groups |
| ISDN | Q.931 ISDN | PRI/BRI stacks |
| CAS | Channel Associated Signaling | CAS stacks |
***
## NAP Status
| Statistic | Type | Description |
| ------------------ | ---------- | -------------------------------------------- |
| **Availability** | Percentage | Percentage of available resources (0-100%) |
| **State** | Status | Overall NAP state (Up / Partially Up / Down) |
| **Usage** | Percentage | Current resource utilization |
| **Congestion** | Text | Congestion status indicator |
| Registration State | Text | SIP registration status (SIP NAPs only) |
### NAP State Values
| Value | Meaning |
| -------------------- | -------------------------- |
| Up (100%) | All resources available |
| Partially Up (1-99%) | Some resources unavailable |
| Down (0%) | No resources available |
***
## Call Metrics
Current real-time call counts for each NAP:
| Statistic | Units | Description |
| ---------------------- | --------- | -------------------------------------------- |
| **Total Call Legs** | Call Legs | Total active call legs on this NAP |
| **Incoming Call Legs** | Call Legs | Current inbound call legs |
| **Outgoing Call Legs** | Call Legs | Current outbound call legs |
| **Incoming MOS** | MOS | Mean Opinion Score for inbound call quality |
| **Outgoing MOS** | MOS | Mean Opinion Score for outbound call quality |
{% hint style="info" %}
MOS (Mean Opinion Score) ranges from 1.0 (poor) to 5.0 (excellent). A score below 3.5 typically indicates noticeable voice quality degradation.
{% endhint %}
***
## Call Counters (Per Interval)
These counters show call activity since the last polling interval.
### Call Attempts
| Statistic | Direction | Description |
| ------------------- | --------- | ---------------------- |
| Incoming Call Count | Incoming | Inbound call attempts |
| Outgoing Call Count | Outgoing | Outbound call attempts |
### Accepted Calls
| Statistic | Direction | Description |
| ----------------- | --------- | ----------------------- |
| Incoming Accepted | Incoming | Accepted inbound calls |
| Outgoing Accepted | Outgoing | Accepted outbound calls |
### Answered Calls
| Statistic | Direction | Description |
| ----------------- | --------- | ----------------------- |
| Incoming Answered | Incoming | Answered inbound calls |
| Outgoing Answered | Outgoing | Answered outbound calls |
***
## CPS Metrics (Per NAP)
Calls per second calculated for each NAP:
| Statistic | Direction | Description |
| --------------------- | --------- | ---------------------- |
| Incoming CPS | Incoming | Inbound call rate |
| Outgoing CPS | Outgoing | Outbound call rate |
| Incoming Accepted CPS | Incoming | Accepted inbound rate |
| Outgoing Accepted CPS | Outgoing | Accepted outbound rate |
| Incoming Answered CPS | Incoming | Answered inbound rate |
| Outgoing Answered CPS | Outgoing | Answered outbound rate |
***
## Drop Statistics
Call drops categorized by cause:
| Statistic | Description |
| ---------------- | ---------------------------------- |
| **Local Drops** | Calls dropped by the local system |
| **Remote Drops** | Calls dropped by the remote party |
| **System Drops** | Calls dropped due to system issues |
Drop counters show the delta since the last interval and include a 10-minute heartbeat to reduce noise during idle periods.
***
## Calculated Statistics
MaaS calculates additional metrics for capacity planning:
| Statistic | Description |
| ------------- | ----------------------------------------- |
| Last Hour Max | Maximum concurrent calls in the past hour |
| Last Hour HWM | Rolling high water mark |
***
## Alerts
### High Severity
| Alert | Condition | Description |
| ----------------------- | -------------------- | ------------------------------------------- |
| NAP Registration Failed | Registration ≠ "Yes" | SIP trunk lost registration (SIP NAPs only) |
### Warning Severity
| Alert | Condition | Description |
| -------------- | -------------------------- | ------------------------------ |
| NAP Down | Availability = 0% | NAP has no available resources |
| NAP Congestion | Congestion status detected | NAP is experiencing congestion |
{% hint style="warning" %}
SIP Registration Monitoring: For SIP NAPs configured with outbound registration (`register_to_proxy` enabled), MaaS monitors the Registration State (Yes/No) and triggers a HIGH severity alert when registration fails. This is critical for detecting trunk failures with carriers that require registration.
{% endhint %}
***
## Understanding NAP Metrics
Call Legs vs Call Count
These two metric types measure different things:
* **Call Legs** (e.g. Incoming Call Legs, Total Call Legs): A **real-time snapshot** of active call legs right now. This value goes up when calls connect and down when calls end.
* **Call Count** (e.g. Incoming Call Count, Outgoing Call Count): A **cumulative counter** that increments with every call attempt. MaaS displays this as the delta per polling interval, showing how many new calls occurred since the last collection.
**Example:** If you have 50 active calls and 200 new call attempts in the last minute, Call Legs = 50 and Call Count (delta) = 200.
Availability vs Usage
* **Availability**: What percentage of resources *can* be used (health indicator)
* **Usage**: What percentage of resources *are* being used (load indicator)
A NAP can have 100% availability but low usage (healthy, light traffic) or high usage with declining availability (approaching capacity limits).
Drop Analysis
Comparing drop types helps identify issues:
* **High Local Drops**: May indicate configuration issues or resource exhaustion
* **High Remote Drops**: May indicate far-end issues or network problems
* **High System Drops**: May indicate system resource issues
Per-NAP CPS
Monitoring CPS per NAP helps identify:
* Which trunks are handling the most traffic
* Load imbalances between NAPs
* Traffic patterns for specific carriers or routes
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