User's Manual

Table Of Contents
176 Operation
Chapter 4 - Operation and Administration
Automatic support of Codec changing in a VoIP call - the DRAP messages
update the BreezeMAX equipment on any Codec change or subsequent
bandwidth allocation change during the call, hence the exact required
bandwidth is always provided. This is essential in fax transmissions where the
call might begin with one Codec and switch to another to accommodate the fax
transmission.
VoIP stack is always in synch with the wireless transport - as the DRAP is
integrated into the VoIP stack all calls are terminated according to the VoIP
standard. Even if no resources are available, the voice gateway receives an
appropriate message from the BreezeMAX system and sends the required
signaling message according to the VoIP standard used.
4.10.1.3 Supporting Generic (3rd Party) VoIP Services
When using VoIP devices that do not support the DRAP protocol, the required
service can be provided through a Data (L2) service with a CG QoS (see
Section 4.10.4.7) that is defined in accordance with the estimated bandwidth
required for the service. The required bandwidth depends on several parameters,
such as codec type, sample rate and T.38 Fax Relay support. The service
parameters depend also on the marking features of the VoIP equipment (the
ability to use either DSCP or 802.1p to distinguish between RTP, RTCP and VoIP
Signaling, and Data traffic).
The system includes several pre-configured Service Profiles for commonly used
VoIP applications.
For details on the pre-configured profiles, refer to Section 4.10.8. For details on
defining Service Profiles for generic VoIP devices, refer to Appendix B.
4.10.1.4 Global and Local Profiles
Global Profiles (Service Profiles and their components - Forwarding Rules, Priority
Classifiers and QoS Profiles) are centrally managed profiles that are distributed to
Base Stations as XML files via TFTP. Global profiles can be changed only by
loading a new XML file; they cannot be created, modified or deleted by either the
Monitor program or SNMP. This concept provides fully centralized control over
these profiles, and ensures that the same profiles with identical content exist in
all Base Stations (assuming that distribution is performed properly).
Local Profiles are intended primarily for special cases when there is a need to
define a Service Profile in one or several Base Stations using either the Monitor
Program or SNMP. There is no way to guarantee that Local profiles with the same
name in two or more Base Stations will have identical content. Local profiles can
be added, modified or deleted using either the Monitor program or SNMP.