To reach IITM telephone extensions from outside, the caller has to dial prefix (044) 2257-xxxx, where xxxx is the PABX number
For residential PABX lines (wherever provided)
- Replace 8xxx with 9xxx
- Replace 4xxx with 6xxx
If residential line is not provided "Number Not Available" or Engaged Tone will be heard.
Board PABX No : IVRS (8000) / ASR (9000)
| NAME | ROLE | BUILDING | ROOM NO. | BUILDING NAME | OFFICE EXTN (PABX). | |
|---|---|---|---|---|---|---|
| Lift-2 at Sindhu | Sindhu | Sindhu Hostels | 8864 | |||
| Lift-2 at Tamiraparani | Tamiraparani | Tamiraparani Hostels | 8944 | |||
| Lift-2 Johnson | ESB | Electrical Sciences Block | 5512 | |||
| Lift-3 @ NAC1 | NAC1 | New Academic Complex | 9223 | |||
| Lift-3 ThyssenKrupp | ESB | Electrical Sciences Block | 5513 | |||
| Lift-4 @ NAC1 | NAC1 | New Academic Complex | 9224 | |||
| Lift-5 @ NAC1 | NAC1 | New Academic Complex | 9225 | |||
| Lift-6 @ NAC1 | NAC1 | New Academic Complex | 9226 | |||
| Lift-7 @ NAC1 | NAC1 | New Academic Complex | 9227 | |||
| Lift-8 @ NAC1 | NAC1 | New Academic Complex | 9228 | |||
| Ligy Philip | Faculty, Civil Engineering | ED | 515 | Department of Engineering Design | 4274 | ligy |
| Low Temparature Lab | HSB | 129 | Department of Humanities and Social Sciences Block | 5867 | ||
| LPCVD Clean Room | ESB | 123 | Electrical Sciences Block | 5539 | ||
| LT Lab Liquefier Room | HSB | 129 | Department of Humanities and Social Sciences Block | 5895 | ||
| Lt. Gen. P. Ravi Shankar | Visiting faculty, Aerospace Engineering | ASE | 110 | Aerospace Engg. Building | 4029 | |
| LTC Unit | ADB | 1 | Central Administration Building | 8240 | ||
| Luoyi Tao | Faculty, Aerospace Engineering | ASE | 112 | Aerospace Engg. Building | 4003 | luoyitao |
| M.A. Final Year Lab (Multimedia Lab) | HSB | 351 | Department of Humanities and Social Sciences Block | 5504 | ||
| M.Tech Admission-1 | GATE | 201 | JEE/GATE Office | 8210 | ||
| M.Tech Admission-2 | GATE | 201 | JEE/GATE Office | 8211 |