Table of Contents
Advertisement
Appendix E - Defining Service Profiles for Generic VoIP Gateways
E.1
Introduction
This section describes the method used for defining the pre-configured Service
Profiles for Generic (3
The same principles can be used for modifying t
creating new on
E.1.1
Priority Marking
We distinguish between two types of Service Profiles for Generic VoIP devices:
Marking is not used: This scenario is applicable when the VoIP device behind
the SU does not support either DSCP or 802.1p marking to distinguish
between different VoIP related traffic types, or when such marking is not used
for any reason. The impl
should be used for all VoIP traffic.
Marking is used: This scenario is applicable when the VoIP device is capable
of marking the diff
different priority marks are used: One for RTP traffic, the second for RTCP and
VoIP Signaling, and a third one for Data (Devi
E.1.2
General Assumptions
Protocol Header: 18 bytes for Ethernet L2 header (including 4 bytes for
VLAN), plus 40 bytes o
RTCP bandwidth: RFC 3556, Session Desc
Modifiers for RTP Control Protocol (RTCP) Bandwidth, states that normally,
the amount of bandwidth allocated to RTCP in an RTP sessi
session bandwidth. To be on the safe side allocate 10% of the RTP ba
to RTCP.
VoIP Signaling: Cisco states that its IP Phones generate approxima
150 bps signaling traffic (without L2 overhead). To be on the safe side assume
2 Kbps of VoIP Signaling traffic for each POTS in
Fax: Fax services are assumed to be based on T.38 Fax
is assumed to be 58 bytes (same as for RTP).
Data: Data traffic may include ARP, DHCP, TFTP, SNMP, HTTP and
management protocols. The recommended default bandwidth value is up to
64 Kbps if a Best Effort connection is used for this traffic. If a Continuous
Grant service is used for all VoIP related tra
268
party) VoIP devices that do not
rd
es for VoIP services that have
ication is that a single Continuous Grant connection
erent VoIP related traffic types. The assumption is that 3
f IP/UDP/RTP headers. A total of 58 bytes.
use the DRAP protocol.
he pre-configured profiles or
different characteristics.
ce Management).
ription Protocol (SDP) Bandwidth
on is 5% of the
terface.
Relay. Protocol Header
ffic, a lower bandwidth will be
BreezeMAX System Manual
ndwidth
tely
other
Advertisement
Table of Contents
