| Technology | Asterisk | Freeswitch |
| PSTN Connectivity (Digium / Sangoma) | dahdi | freetdm |
| IAX2 | mod_iax | ?? none stable yet. Use Asterisk to forward traffic via SIP. Enable Hardware HPET for IAX2 trunk if card not available for Asterisk |
| Bluetooth Channel | chan_mobile | ?? Use asterisk via SIP |
| Skype | Skypeforasterisk (no longer for sale) | mod_skypeopen |
| CDR Stadistics | Arternic cdr-stats | ?? |
| Queue Statistics | Asteriskguru queue-stats | ?? |
| Web Management | Freepbx | ?? |
| IVR | AGI / AMI | Event Socket |
| Codec G.729 | Transcodind Cards G.729 licenses Free G.729 (Intel IPP) |
Transcodind Cards G.729 licenses fsg729 Intel IPP(any experience with it ? ) |
| Fax Handling | Iaxmodem with Hylafax | ?? Iaxmodem via asterisk to FS via SIP ? |
| SIP | chan_sip | sofia |
| ACD | app_queue | mod_callcenter |