| AckableIncomingResponseWithSession | Incoming INVITE response received when request is accepted. |
| Body | Message body. |
| ClientTransactionUser | UAC Core Transaction User. |
| Contact | Contact. |
| DialogState | Dialog state. |
| IncomingAckRequest | Incoming ACK request. |
| IncomingByeRequest | Incoming BYE request. |
| IncomingByeResponse | Incoming BYE response. |
| IncomingCancelRequest | Incoming CANCEL request. |
| IncomingCancelResponse | Incoming CANCEL response. |
| IncomingInfoRequest | Incoming INFO request. |
| IncomingInfoResponse | Incoming INFO response. |
| IncomingInviteRequest | Incoming INVITE request. |
| IncomingMessageRequest | Incoming MESSAGE request. |
| IncomingMessageResponse | Incoming MESSAGE response. |
| IncomingNotifyRequest | Incoming NOTIFY request. |
| IncomingNotifyResponse | Incoming NOTIFY response. |
| IncomingPrackRequest | Incoming PRACK request. |
| IncomingPrackResponse | Incoming PRACK response. |
| IncomingPublishRequest | Incoming PUBLISH request. |
| IncomingPublishResponse | Incoming PUBLISH response. |
| IncomingReferRequest | Incoming REFER request. |
| IncomingReferResponse | Incoming REFER response. |
| IncomingRegisterRequest | Incoming REGISTER request. |
| IncomingRegisterResponse | Incoming REGISTER response. |
| IncomingRequest | A SIP message sent from a remote client to a local server. |
| IncomingRequestDelegate | Delegate providing custom handling of incoming requests. |
| IncomingRequestWithSubscription | Incoming NOTIFY request with associated Subscription. |
| IncomingResponse | A SIP message sent from a remote server to a local client. |
| IncomingSubscribeRequest | Incoming SUBSCRIBE request. |
| IncomingSubscribeResponse | Incoming SUBSCRIBE response. |
| OutgoingAckRequest | Outgoing ACK request. |
| OutgoingByeRequest | Outgoing BYE request. |
| OutgoingCancelRequest | Outgoing CANCEL request. |
| OutgoingInfoRequest | Outgoing INFO request. |
| OutgoingInviteRequest | Outgoing INVITE request. |
| OutgoingInviteRequestDelegate | Delegate providing custom handling of outgoing INVITE requests. |
| OutgoingMessageRequest | Outgoing MESSAGE request. |
| OutgoingNotifyRequest | Outgoing NOTIFY request. |
| OutgoingPrackRequest | Outgoing PRACK request. |
| OutgoingPublishRequest | Outgoing PUBLISH request. |
| OutgoingReferRequest | Outgoing REFER request. |
| OutgoingRegisterRequest | Outgoing REGISTER request. |
| OutgoingRequest | A SIP message sent from a local client to a remote server. |
| OutgoingRequestDelegate | Delegate providing custom handling of outgoing requests. |
| OutgoingRequestMessageOptions | Outgoing request message options. |
| OutgoingResponse | A SIP message sent from a local server to a remote client. |
| OutgoingResponseWithSession | Outgoing INVITE response with the associated Session. |
| OutgoingSubscribeRequest | Outgoing SUBSCRIBE request. |
| OutgoingSubscribeRequestDelegate | Delegate providing custom handling of outgoing SUBSCRIBE requests. |
| PrackableIncomingResponseWithSession | Incoming INVITE response received when request is progressed. |
| RequestOptions | Request options bucket. |
| ResponseOptions | Response options bucket. |
| ServerTransactionUser | UAS Core Transaction User. |
| Session | Session. |
| SessionDelegate | Session delegate. |
| Subscription | Subscription. |
| SubscriptionDelegate | Subscription delegate. |
| TransactionUser | Transaction User (TU). |
| Transport | Transport layer interface expected by the user agent core. |
| UserAgentCoreConfiguration | User Agent Core configuration. |
| UserAgentCoreDelegate | User Agent Core delegate. |