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Voice and Call Quality

Sipura/LinkSys CODEC selection


Problem:

CODEC description



Solution:

1. G.711 (A-law and mµ-law)
This very low complexity codec supports uncompressed 64 kbps digitized voice transmission at one through ten 5 ms voice frames per packet. This codec provides the highest voice quality and uses the most bandwidth of any of the available codecs.

2. G.726
This low complexity codec supports compressed 16, 24, 32 and 40 kbps digitized voice transmission at one through ten 10 ms voice frames per packet. This codec provides the highest voice quality.

3. G.729A
The ITU G.729 voice coding algorithm is used to compress digitized speech. G.729A is a reduced complexity version of G.729. It requires about half the processing power to code G.729. The G.729 and G.729A bit streams are compatible and interoperable, but not identical.

4. G.723.1
The SPA supports the use of ITU G.723.1 audio codec at 6.4 kbps. Up to 2 channels of G.723.1 can be used simultaneously. For example, Line 1 and Line 2 can be using G.723.1 simultaneously, or Line 1 or Line 2 can initiate a 3-way conference with both call legs using G.723.1.

5. GSM – Uses several codec specifications like: Half Rate (5.6 kbit/s),  Full Rate (13 kbit/s),  Enhanced Full Rate (EFR) (12.2 kbit/s) and a variable-rate codec called AMR-Narrowband, which is high quality and robust against interference when used on full rate channels.



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Our Home Phone Service includes Internet phones with free Internet calling and unlimited US and Canada plans. We offer prepaid phone service and International DID numbers using our voice over IP system and an analog telephone adaptor (ATA). The solutions are designed for home phone service, business phone service, call shops, telemarketing firms and cyber cafes. InPhonex is proud to support Internet telephony equipment (IP Phones) including Sipura 2000, Sipura 3000, Cisco 186, Linksys PAP2 and other SIP phone adaptors. We also support Asterisk PBX, Trixbox and offer turn-key VoIP Reseller business opportunities to let entrepreneurs and businesses resell voice over Internet (VoIP) under their brand name.

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