
Interoperability 177
IP Telephony Configuration Guide
Symbol NetVision telephones
In order to make calls between Symbol telephones and Business Communications Manager, each
must be configured to have at least one common codec. The following codecs are supported by the
NetVision telephones.
• G.711 u-law
• G.711 A-law
• G.729 Annex A and Annex B
Software interoperability compatibility and constraints
The following section provides an overview of VoIP trunk compatibility issues.
H.323 trunk compatibility issues
The following tables provide a brief overview of the IP trunking and telephony compatibility
issues, including NetVision handset restrictions, and Gatekeeper restrictions. The tables are
organized by Business Communications Manager software release numbers.
Table 46 Software interoperability restrictions and limitations for IP trunking
Software release Description of restriction/limitation
All versions ITG/IPT payload sizes should be set to 30 ms.
All versions Silence suppression should be configured to the same value on both the Business
Communications Manager and the M1--ITG/IPT (for example: both on or both off).
Silence suppression is called Voice Activity Detection on the M1-ITG/IPT.
2.03 GA
2.5 GA
M1-ITG/IPT interaction with more than one ITG/IPT: when transferring, conferencing,
working with two or more ITG/IPT cards, they must be on the same subnet. If they are not on
the same subnet, one-way speech path situations can occur.
2.5 FP1
2.5 FP1 MR1.1
3.0, 3.0.1
The profile on the ITG/IPT must be set to the same first preferred codec as that of the
Business Communication software. Software on the ITG trunk card must be 2.X.25 release.
IPT card must be version 3.0 or 3.1.
In order for features such as Transfer and Conference to operate correctly between all
Business Communications Managers and ITG/IPTs in a network, these are the rules:
• The First Preferred Codec for VoIP Trunks must be the same on all Business
Communications Managers. This is configured in Unified Manager under Services,
IP Telephony, H.323 Trunks, Media Parameters.
• In addition, if the first preferred codec is G.729 or G.723, the Silence Suppression option
on that page must be the same on all Business Communications Managers in the
network.
The Business Communications Manager supports only basic call to/from NetMeeting.(S/W
version FP1 GA)
2.5 GA, 2.5 FP1,
3.0, 3.0.1
FAX over IP is not supported.
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