# Web Service Attributes Editor: Quality of Service: Advanced Configuration

In the Quality of Service tab's, Advanced Configuration section, on the client side for clients that interact with Quality of Service enabled web services, you can set the following related fields.

Element | Description
--- | ---
RM Resend Interval (ms) | The time in milliseconds after which the sender (RMSource) resends unacknowledged messages to the receiver (RM Destination) . By default, resends happen every 2000ms.
RM Close Timeout (ms) | By default, the call to `proxy.close()` will not return until all messages have been acknowledged. RM close timeout is the interval (in milliseconds) that the client runtime will block waiting for a call to `close(`) to return. If there are still unacknowledged messages after this interval is reached, and the call to close has returned, an error will be logged about messages being lost.
RM Ack Request Interval (ms) | The suggested minimum time that the sender (RMSource) should allow to elapse between Acknowledgement requests to the receiver (RMDestination).
Secure Session Token Lifetime (ms) | The life span of the security context. The security context expires when the value set here expires.
Renew Expired Secure Session Tokens | Specifies when the expired security context will be renewed. If not set, the expired security context will automatically be renewed.

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