SLP Message Types

Service Request 

SrvRqst

1 

Issued by a UA to find services or by a UA or SA server during active DA discovery. 

Service Reply 

SrvRply

2 

The DA or SA response to a service request. 

Service Registration 

SrvReg

3 

Enables SAs to register new advertisements, to update existing advertisements with new and changed attributes, and to refresh URL lifetimes. 

Service Deregistration 

SrvDereg

4 

Used by the SA to deregister its advertisements when the service they represent is no longer available. 

Acknowledgment 

SrvAck

5 

The DA response to an SA's service request or service deregistration message. 

Attribute Request 

AttrRqst

6 

Made either by URL or by service type to request a list of attributes. 

Attribute Reply 

AttrRply

7 

Used to return the list of attributes. 

DA Advertisement 

DAAdvert

8 

The DA response to multicast service requests. 

Service Type Request 

SrvTypeRqst

9 

Used to inquire about registered service types that have a particular naming authority and are in a particular set of scopes. 

Service Type Reply 

SrvTypeRply

10 

The message that is returned in response to the service type request. 

SA Advertisement 

SAAdvert

11 

UAs employ the SAAdvert to discover SAs and their scopes in networks where no DAs are deployed.