-OSSL_CMP_SRV_CTX_setup_polling() sets in the given I<srv_ctx> callback functions
-for reseting transaction and intitiating delayed delivery.
+OSSL_CMP_SRV_CTX_init_trans() sets in I<srv_ctx> the optional callback
+functions for initiating delayed delivery and cleaning up a transaction.
+If the <delay> function is NULL then delivery of responses is never delayed.
+Otherwise I<delay> takes a custom server context and a request message as input.
+It must return 1 if delivery of the respecive response shall be delayed,
+0 if not, and -1 on error.
+If the <clean> function is NULL then no specific cleanup is performed.
+Otherwise I<clean> takes a custom server context and a transaction ID pointer
+as input, where the pointer is NULL in case a new transaction is being started
+and otherwise provides the ID of the transaction being terminated.
+The <clean> function should reset the respective portions of the state
+and free related memory.
+It must return 1 on success and 0 on error.