| Similarity | Rank | |
|---|---|---|
| VoIP | 0.807 | 13975 |
| PSTN | 0.803 | 70140 |
| trunking | 0.794 | 85801 |
| PBX | 0.787 | 33153 |
| Telephony | 0.777 | 74891 |
| Asterisk | 0.774 | 57059 |
| VOIP | 0.772 | 38302 |
| Multicast | 0.771 | 92132 |
| TCP | 0.762 | 17992 |
| MPLS | 0.762 | 55681 |
| IP-based | 0.749 | 68683 |
| RADIUS | 0.748 | 94057 |
| TDM | 0.748 | 74446 |
| NAT | 0.747 | 43936 |
| ISDN | 0.746 | 57455 |
| IPsec | 0.744 | 74526 |
| multicast | 0.742 | 48021 |
| BGP | 0.740 | 68294 |
| XMPP | 0.738 | 99566 |
| IP | 0.735 | 4361 |
| Lync | 0.734 | 52221 |
| Routing | 0.733 | 44001 |
| IPv6 | 0.732 | 24097 |
| Mitel | 0.731 | 89951 |
| VLAN | 0.728 | 65730 |