•
G.711 (A and µ)
•
G.723.1 (5.3kbps, 6.4kbps)
•
G.729
•
G.729A
Echo Cancellation:
An AT&T certified G.168 echo canceler meets and exceeds G.168-2002 standards. The
echo canceler can operate with delays as high as 128msec. It is better than industry
standard cancelers under the most important and difficult conditions like double-talk
and the presence of background noise.
Route and Routeset Configuration:
In a Telesis PX24U/PX24M Hybrid IP PBX system, a SIP user agent may have its own
route number. It is possible to define numerous distinct routes. A given route to a
particular destination and its accompanying alternate routes are grouped in a routeset.
Each route in a routeset has a priority order. Alternate routes may be SIP user agents or
TDM (PSTN) lines. Routing to the next priority alternate route is possible in the event
that a route becomes unavailable.
Call Routing:
A Telesis PX24U/PX24M Hybrid IP PBX system routes a call from the TDM network
to the IP network according to:
•
Dialed digits (called number)
•
Calling party number and information elements whenever available, such that:
•
Category of calling party
•
NOA of calling party
•
Numbering plan of calling party
•
Presentation status of calling party
•
Screening status of calling party
AES 256 MEDIA ENCRYTION FOR VOIP CALLS
Introduction:
Telesis PX24U/PX24M Hybrid IP PBX systems are all-in-one solutions with integrated
gatekeeper, softswitch capability, IP-TDM routing (gateway) functions, and numerous
IP and traditional system features. Even though the media encrypting algorithm
explained here is applicable for H.323 endpoint-to-endpoint connection too, it is
recommended for H.323 endpoint-to-gatekeeper connection for further security.
The following paragraphs demonstrate algorithms applied for site-to-site
communication in brief, such that:
•
Two Telesis systems in each site
•
Both systems are provided with necessary licenses for the VoIP media security
and their parameters are set accordingly.
Secure Gatekeeper Registration:
Two Telesis systems share an account name and a secret, which is the password. One
system ,as an H.323 endpoint, registers to the gatekeeper of the other with the shared
account name and the password. For the registration, H.225 RAS messages are
exchanged between the two Telesis systems according to the H.235 Baseline Security
Profile with or without integrity check. The baseline security profile provides basic
security for endpoint-to-gatekeeper registration using the secure password-based
HMAC-SHA1-96 hashing algorithm.
Baseline authentication:
For H.323 endpoint-to-gatekeeper registration, RAS message
authentication is according to H.235 Baseline Security Profile standards. This security
service supports authentication of selected fields only, but does not provide full
message integrity. The authentication-only security profile may be preferable for the
messages traversing NAT/firewall devices. Hashing algorithm is the password-based
HMAC-SHA1-96.
Baseline integrity:
For H.323 endpoint-to-gatekeeper registration, RAS message
authentication and integrity is according to H.235 Baseline Security Profile standards.
This is a security combining both message integrity and the authentication. Hashing
algorithm is the password-based HMAC-SHA1-96.
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Summary of Contents for PX24M
Page 1: ...PX24U PX24M HYBRID IP PBXs...