| 1. | Bicc bearer control tunneling protocol
bicc载体控制通道协议 |
| 2. | Pptp : point to point tunneling protocol
点对点通道协议 |
| 3. | Pptp : point to point tunneling protocol
点对点通道协议 |
| 4. | Pptp point to point tunneling protocol
点对点通道协议 |
| 5. | Pptpoint to point tunneling protocol
点对点通道协议 |
| 6. | Point to point tunneling protocol
点对点通道协议 |
| 7. | Layer two tunneling protocol
第二层通道通信协议 |
| 8. | L2tp layer 2 tunneling protocol
二级通道协议 |
| 9. | L2tp layer 2 tunneling protocol
二级通道协议 |
