If an account is created with a SIP/TLS registrar and contact_use_src_port set to PJ_TRUE (the default), the hostname of the server will be unavailable. If the transport was created with verify_server set to PJ_TRUE, all secure connections will fail, because there will be no server name to match to the server certificate The cause is that, if contact_use_src_port is set, pjsua_acc_get_uac_addr will call pjsip_endpt_acquire_transport, which will call pjsip_tpmgr_acquire_transport, which will create a new transport with a NULL tdata. Since the TLS transport gets the server name from the first request's tdata, if none is provided, the transport will be created without a server name If contact_use_src_port is not set, the transport will be created as a side effect of the SIP state machine, by the first message sent, which will have a tdata with a server name set
