STARFACE uses several compression codecs to ensure that telephone calls can be placed particularly inexpensively and without any noticeable decrease in quality:
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G.711: 64 kbit/s — 80 kbit/s data transfer rate
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G.723: 6.3 kbit/s — 15.9 kbit/s data transfer rate
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GSM: 13 kbit/s — 29 kbit/s data transfer rate
Codec G.729 at 8 kbit/s — 24 kbit/s data transfer rate is also available. However, it entails additional licensing costs and therefore is not a standard part of the package.
STARFACE both supports and is based on standardized protocols. This ensures a high degree of interoperability within and between systems. The protocols used most often are SIP and IAX2 (optional). However, the H.323 protocol is also available.