This documentation is for OpenSER/OpenSIPS version 1.2.x.
| Module name | Description | Status |
| ACC | Accounting module | stable |
| ALIAS_DB | Database SIP aliases module | stable |
| AUTH | Authentication Framework module | stable |
| AUTH_DB | Database-backend authentication module | stable |
| AUTH_DIAMETER | DIAMETER-backend authentication module | unmaintained |
| AUTH_RADIUS | RADIUS-backend authentication module | stable |
| AVPOPS | AVP operation module | stable |
| AVP_RADIUS | RADIUS-backend for AVP loading module | stable |
| CPL-C | CPL interpreter module | stable |
| DBTEXT | Text-backend for database API module | stable |
| DIALOG | Dialog support module | stable |
| DISPATCHER | Dispatcher (load-balancer) module | stable |
| DIVERSION | Diversion header insertion module | stable |
| DOMAIN | Multi-domain support module | stable |
| DOMAINPOLICY | Policies to connect federations | alpha |
| ENUM | ENUM lookup module | stable |
| EXEC | External exec module | stable |
| FLATSTORE | Fast writing-only text-backend for database module | stable |
| GFLAGS | Global shared flags module | stable |
| GROUP | User-groups module with DB-backend | stable |
| GROUP_RADIUS | User-groups module with RADIUS-backend | stable |
| IMC | Instant Messaging Conferencing module | alpha |
| JABBER | JABBER IM and PRESENCE interconnection module | beta |
| LCR | Least Cost Routing module | stable |
| MANGLER | SIP mangler module | stable |
| MAXFWD | Max-Forward processor module | stable |
| MI_FIFO | FIFO support for Management Interface | alpha |
| MI_XMLRPC | XMLRPC support for Management Interface | alpha |
| MEDIAPROXY | NAT traversal module | stable |
| MSILO | SIP message silo module | stable |
| NATHELPER | NAT traversal helper module | stable |
| MYSQL | MYSQL-backend for database API module | stable |
| OPTIONS | OPTIONS server replier module | stable |
| OSP | OSP peering module | stable |
| PATH | Path support for SIP loadbalancer | stable |
| PDT | Prefix-to-Domain translator module | stable |
| PERL | embed execution of Perl function | alpha |
| PERMISSIONS | Permissions control module | stable |
| PIKE | Flood detector module | stable |
| PRESENCE | Presence server module - common API | alpha |
| POSTGRES | POSTGRES-backend for database API module | stable |
| PUA | Common API for presence user agent client | alpha |
| PUA_MI | MI extension for PUA | alpha |
| PUA_USRLOC | USRLOC extension for PUA | alpha |
| REGISTRAR | SIP Registrar implementation module | stable |
| RR | Record-Route and Route module | stable |
| SEAS | Sip Express Application Server (interface module) | alpha |
| SIPTRACE | SipTrace module | stable |
| SL | Stateless replier module | stable |
| SMS | SIP-to-SMS IM gateway module | stable |
| SNMPStats | SNMP interface for statistics module | alpha |
| SPEEDDIAL | Per-user speed-dial controller module | stable |
| STATISTICS | Script statistics support | stable |
| SST | SIP Session Timer support | alpha |
| TEXTOPS | Text operations module | stable |
| TLSOPS | TLS operations module | stable |
| TM | Transaction (stateful) module | stable |
| UAC | UAC functionalies (FROM mangling and UAC auth) | stable |
| UAC_REDIRECT | UAC redirection functionality | stable |
| URI | Generic URI operation module | stable |
| UNIXODBC | unixODBC driver module | stable |
| URI_DB | URI operation with database support module | stable |
| URI_RADIUS | URI operation with RADIUS support module | stable |
| USRLOC | User location implementation module | stable |
| XLOG | Advanced logger module | stable |
| XMPP | SIP-to-XMPP Gateway (SIP to Jabber/Google Talk) | alpha |