A complete telephony migration lab: Alcatel-Lucent OXO Connect IP-PBX, carrier SIP trunk, voice VLAN and 40 IP phones.
LabA lab: designed and documented end to end, modelled on the installations I work on as an apprentice. Not a client engagement.
Stack
- Telephony
- Alcatel OXO Connect
- OMC
- SIP trunk
- Networking
- VLAN 802.1Q
- LLDP-MED
- PoE+
- QoS DSCP
- FortiGate
Context
Scenario: a 40-employee company on two floors, with an ageing PBX at end of life and ISDN lines set to disappear as France shuts down its copper network. Goal: move to IP telephony without changing numbers, with a reception desk, departments reachable directly and no visible outage for callers.
Role
Lab project: sizing, numbering plan, voice network design and cutover procedure, documented as for a real commissioning. It is the kind of installation I work on as an apprentice; this file formalises it end to end.
Architecture
Carrier
8-channel SIP trunk, ported numbers
FortiGate
SIP ALG disabled, rules towards the carrier
Huawei PoE+ switches
Voice VLAN 20 via LLDP-MED, DSCP EF / CS3
OXO Connect
IP licences, auto attendant, hunt groups, voicemail
40 IP phones
Offices + operator phone at reception
Analogue ports
Fax and alarm
Numbering plan
| Number | Assignment | Behaviour |
|---|---|---|
| Main line | Main direct number | Greeting, then auto attendant: 1 Sales · 2 Support · 3 Accounts |
| 201 – 222 | First-floor phones (22) | Individual direct number per phone |
| 301 – 318 | Second-floor phones (18) | Individual direct number per phone |
| 500 | Reception hunt group | Rings all phones, overflows to 510 after 20 s |
| 510 | Sales hunt group | Round robin, voicemail after 30 s |
| 0 | Outside line | Out through the SIP trunk |
Challenges
Sizing the OXO Connect (chassis, boards, IP licences and a SIP trunk for 8 simultaneous calls); isolating voice in a dedicated VLAN pushed automatically to the phones via LLDP-MED; protecting call quality with DSCP EF marking on RTP and CS3 on signalling, honoured end to end; disabling the firewall's SIP ALG, a classic cause of one-way audio; and planning an out-of-hours cutover with number porting and a rollback plan.
Outcome
A full commissioning file: architecture diagram, numbering plan, voice addressing, OXO configuration (auto attendant, hunt groups, day/night schedules, voicemail) and cutover procedure. Ready to reuse as the basis for a real installation.
Highlights
- 40 PoE+ IP phones, voice VLAN assigned automatically (LLDP-MED)
- 8-channel SIP trunk, direct numbers kept through porting
- Reception: greeting, 3-option auto attendant, overflow to a hunt group
- Out-of-hours cutover with a documented rollback