Pozri následujúcu tabuľku:
Asterisk/Trixbox | SER | OpenSER | |
SIP protokol | yes | yes | yes |
NAT Traversal | no | yes | yes |
RTP Relay | yes | yes | yes |
IPv4 | yes | yes | yes |
IPv6 | no | yes | yes |
ENUM | yes | yes | yes |
Digest Auth | yes | yes | yes |
ACL | yes | yes | yes |
Accounting | yes | yes | yes |
MySQL driver | yes | yes | yes |
LDAP | yes | yes | yes |
Call forwarding/transfer | yes | yes | yes |
Call parking | yes | no | no |
Caller ID | yes | yes | yes |
IVR | yes | SEMS | SEMS |
Macros | yes | no | no |
Music on whatever | yes | no | no |
Open Settlement Protocol | yes | yes | yes |
Protocol conversion | yes | no | no |
Transcoding | yes | no | no |
Trunking | yes | no | yes |
Voicemail | yes | SEMS/* | SEMS/* |
SEMS – s využitím SIP Express Media Server SEMS/* – s využitím SEMS alebo Asterisk