In analog networks no synchronization problems occur; TDM-type networks work isochronously; in all situations the speech channel is associated to a physical channel in the network. The delays in the networks are typically well controlled due to proper transmission planning. Within the network of one operator, conversational speech quality problems due to high delay are unlikely as long as terrestrial transmission systems are used within the network. As soon as satellite transmission is used, e.g., for transcontinental communication, the communication dynamics may be impaired due to long delay which is typically around 240ms one-way transmission time.
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References
3GPP: TS 46.010: Full Rate Speech Encoding, Third Generation Partnership Project (3GPP), 2002
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Gierlich, H. (2008). Networks and Their Influence on Communication Quality. In: Havelock, D., Kuwano, S., Vorländer, M. (eds) Handbook of Signal Processing in Acoustics. Springer, New York, NY. https://doi.org/10.1007/978-0-387-30441-0_49
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