NEC IP-PBX Configuration (SV9100/SL2100)

Before you start: what we are building

A simple office phone system: named extensions, DID and DIL routing, hunt groups, working voicemail, short menus, and stable IT settings for QoS, VLAN, backups, and security.

Name an extension

15-01: Extension Basic Setup
• Select ICM Extension → Name = "Amy"
• Apply → Save

This updates phone displays and the internal directory.

Change an extension number

11-02: Extension Numbering
• Select Port/Ext → New Number = 110
• Apply → Save

Use 1xx for users, 2xx for groups, 7xx for features.

Outbound dial access and ARS

11-09: Trunk Access Code
• Access Code = 9
Link to ARS so 9+number routes to the right trunk group

Toll classes and override PIN

21-04: Toll Class per Extension
21-05/21-06: Allowed/Blocked patterns per Class
21-07: Override Password (walking PIN) for supervisors

Give staff a limited class. Give supervisors an override PIN.

Set outgoing caller ID

21-13: ISDN/SIP Calling Party Number
• Select Extension → set CLI per carrier format
• Save

Some carriers override CLI. Coordinate with them.

Analog trunks and devices

14-01: Put ports in a Trunk Group
14-02: Trunk Type (Loop Start, DID, etc.)
14-06: Trunk Group Routing (tie to ARS)

11-02: Create the SLT extension
15-01: Name it and adjust SLT options
Test fax send/receive

SIP trunk basics

SIP Line (84-xx): Registrar/Proxy, auth username/password
DTMF (84-35): RFC2833 or per carrier
Line Group ID: assign (e.g., 50: Main)

Inbound routing: DIL and DID

22-07: Send trunk to a single destination (Reception)
22-08: No-answer destination after a timer

22-10: Translation table size
22-11: Translate received digits → ext/group
22-13: Assign table to trunk group

Unmatched/Vacant:
22-12: DID Intercept Ring Group for fallback

Point main number to Reception or AA; map other DIDs to Sales or Support.

Hunt groups and pickup

Ext = 201
Members = 100,101,102
Ring = Collective
Voicemail after 20s

23-02: Put a team in the same pickup group
Users can answer each other's ringing phones

Auto attendant and voicemail

1. Create Open and After-Hours. Route DIL/DID to AA or Reception.
2. Record short menus: Press 1 for Sales, 2 for Support, 0 for operator.
3. Enable voicemail per user or group. Set timeouts and email alerts.

Phone feature codes

Use these on a multiline set unless noted. Codes may be customized by installers.

821 → Handsfree Answerback ON
823 → Forced Intercom Ring
Tip: while calling, press 1 to toggle

848 → CF Immediate (All) then destination
844 → CF Busy/No-Answer then destination
842 → Both Ring
846 → Follow-Me

856 → Group Call Pickup
868 → Park a call
869 → Retrieve parked call

855 → Program Station Speed
#4 → Use Group/System Speed Dial

Program from the phone

Assign a feature key

1. Speaker → 851
2. Press the spare key
3. Enter key code → Speaker to save

Examples
10 → Call Forward All
13 → Call Forward Busy/No-Answer
14 → Both Ring
15 → Follow-Me
07 → Group Call Pickup
03 → One-Touch / DSS / Speed

To erase a key: Speaker → 852 → press the key → Speaker

One-Touch to outside number

1. Speaker → 851
2. Press target key → 03 → Speaker
3. Press key → 9 + number → Hold/Save → Speaker

Analog phones (SLT)

• Lift handset and dial the same service codes.
• SLTs do not have LEDs or feature keys.
• Heavy users should use a multiline set.

Printable quick reference

Internal call                Dial ext (100 → 101)
Outside line                 9 + number
Auto-answer ON / OFF         821 / 823
Call Forward All / B/NA      848 / 844  (842 Both Ring, 846 Follow-Me)
Group Pickup                 856
Park / Retrieve              868 / 869
Transfer (att/blind)         Transfer → ext / Transfer → ext (hang up)
3-Way Conference             Conf → dial → Conf
Voicemail                    VM Pilot then mailbox
Toll Override                875 + password + 9 + number
Program key assign/erase     851 / 852
BGM / Page Zones             Use assigned keys
Group Login/Logout           Use assigned key

IT extras

• QoS: DSCP 46 EF. Trust DSCP on switches. Prioritize uplink.
• Voice VLAN with DHCP options if needed.
• Set NTP and DNS for clean logs and stamps.
• Backups in WebPro/PCPro. Keep off-box copies.
• Logging: SMDR to a collector. SNMP for ports and trunks.
• Security: change defaults, restrict remote access, tighten toll classes, issue override PINs sparingly.

10-minute test plan

✅ Ext→Ext call
✅ 9 + number outbound
✅ Main number → Reception/AA
✅ DID to Sales/Support
✅ Voicemail deposit and retrieve
✅ DTMF through carrier IVR
✅ Pickup and Park
✅ Fail a trunk group → alternate route works
✅ Reboot a phone → re-registers clean

FAQ

What's the difference between DIL and DID routing? DIL sends all calls on a trunk to one destination, while DID translates received digits to route calls to specific extensions or groups.

How do I backup my NEC system configuration? Use WebPro or PCPro to create backups. Store copies off-site and test restore procedures regularly.

What's the best practice for extension numbering? Use 1xx for users, 2xx for hunt groups, 7xx for features. This keeps the dial plan organized and allows for future expansion.

How do I troubleshoot SIP trunk issues? Check registrar settings, DTMF method (84-35), network connectivity, and coordinate with your carrier on authentication and transport requirements.

What QoS settings should I use for NEC systems? Set DSCP 46 for voice traffic, configure voice VLANs if needed, and ensure switches trust and prioritize DSCP markings on uplinks.

Configuration guide for NEC SV9100 and SL2100 systems. Always follow manufacturer documentation and local telecom regulations.