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EXPERTISE
& PREVIOUS ENGAGEMENTS
Voice Over IP Protocols
Sigpro has extensive experience
in H.323, SIP, and SCCP protocols for VoIP as well
as their DSP elements such as audio codecs (G.711, G.723.1,
G.726, G.728, G.729), fax over IP protocols (T.38), echo cancellation
(G.165 & 168), comfort noise generation, and voice activity
detection.
VoIP System Architectures:
Architectural designs
from Sigpro have been employed by a number of VoIP equipment
manufacturers and service providers. These include:
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Terminal device manufacturers seeking to expand product
lines from PSTN and PBX solutions to IP-based telephony
for the enterprise and residential markets
- Long-distance
carriers seeking toll-bypass communication
- Unified
messaging providers requiring centralized consumer products
(voice, text, email, fax) within a single IP network
base
- Cellular
equipment providers requiring gateways to convert mobile
wireless signaling protocols to those that are compatible
with VoIP standards
Set-Top Box Telephony & Converged Media:
Early in its history, Sigpro developed a series of H.323-compliant
voice codecs to support a video teleconferencing reference
design for a premier computer manufacturer. This work also
included architecting a DSP-based MPEG decoder. The
CPU-optimized codecs were designed for use in web-based
servers, with low-power versions of these systems targeted
for the "web phone" market.
More recently, Sigpro has delivered telephony service enhancements
for an industry-leading set-top box manufacturer. As a member
of the engineering design team, Sigpro defined the product
roadmap to roll out POTS-based devices, and later full VoIP
services. Our design team's contribution spanned from conceptual
design to product implementation, including product lifecycle
plan, systems architecture, prototype development, testing
and validation.
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