Polycom Vega Gateway User Manual

Page 33

Version 2.1

16 March 2006

Page 33 of 33

Vega Gateway Scenarios.

Examples are given in best faith – ensure that you check the capabilities of systems before

deploying them, especially the functionality of devices not designed and delivered by VegaStream.

11. Appendix 2 – Things to consider

Audio quality

• Ensure that the IP network does not drop data

• Use QOS to ensure that VoIP traffic is given priority through routers

• Choose best quality codec that is possible for the bandwidth available

• Turn off silence suppression

• Turn off Echo cancellation

Existing firewalls

• Ensure that the existing firewall / NAT can cope with the data bandwidth required for the

voice traffic (ensure that they do not drop packets, introduce too much latency or introduce
too much jitter). If it cannot, consider using a specialist VoIP firewall for handling just the
VoIP traffic.

• Beware, some VoIP aware firewalls ‘get it wrong’. A VoIP-aware firewall that mis-translates

things can be worse than a non VoIP-aware firewall. Check that the VoIP-aware firewall
works correctly or turn off the functionality and use a purpose-designed product.

Contact Details
Email: [email protected]
Web: www.vegastream.com
www.vegaassist.com

EMEA Office

VegaStream Limited
The Western Centre
Western Road
Bracknell
Berks RG12 1RW
UK

+44 (0) 1344 784900

USA Office

VegaStream Inc.
6200 Stoneridge Mall Road
3rd Floor
Pleasanton
California 94588
USA

+1 925 399 6428

VoIPon Solutions www.voipon.co.uk [email protected] Tel: +44 (0) 1245 600560