HP 7102dl - ProCurve Secure Router Configuration Manual page 413

Although SIP can theoretically operate directly between two end users, in
practice, SIP proxy and registrar servers are usually necessary. For example,
a user's SIP device needs certain information in order to invite a second user
to open a call, or session. This information includes:
the user's registration information, which associates the SIP user with its
current location
a route to the user's current location
It is not feasible that each SIP device store all of this information for every
user that it may need to reach.
Instead, devices send their registration information to registrar servers, which
map users to their current locations. When one user calls another, the SIP
device sends the invitation to its proxy servers. Proxy servers look up regis-
trations and forward the invitations to the correct end user. Proxy servers can
also forward other SIP messages used to maintain and terminate a session.
Because the same server often provides both proxy and registrar services, the
two can often be considered in conjunction with each other.
The ProCurve Secure Router supports both proxy and registrar services.
Follow these steps to configure SIP services on your ProCurve Secure Router:
1. Enable SIP from the global configuration mode context:
Syntax: ip sip
2. Enable SIP proxy:
Syntax: ip sip proxy
3. You should also configure your router to act as a registrar:
a. From the global configuration mode context, enable the SIP registrar:
Syntax: ip sip registrar
b. Enable the proxy server to save the registration information that it
receives from users to a local location database:
Syntax: ip sip database local
Setting Up Quality of Service
Example: Configuring QoS for VoIP
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