Message Type |
Abbreviation |
Function Code |
Description |
---|---|---|---|
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 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 |