Zitat von A J Stiles <asterisk_list at earthshod.co.uk>: Hi,> GSM is the native codec used for calls to mobile phones; it uses lossy > compression to achieve a low bit rate. > > A-law is the native codec used by physical exchanges on the land line network > (PSTN and ISDN). It is non-lossy. It works by arranging the "steps" closer > together near the zero line, and further apart away from it; so the > difference > between the actual signal and the nearest digital representation is small in > proportion to the signal.Well, but for voice quality, which codec is better? alaw or gsm? Thanks Luca Bertoncello (lucabert at lucabert.de)
On Monday 06 Jul 2015, Luca Bertoncello wrote:> Well, but for voice quality, which codec is better? > alaw or gsm?A-law is better for voice quality (sorry, thought my original explanation was obvious). But note that if the destination is a mobile phone, GSM will be used anyway, at least for the link between the final cell tower and the handset. -- AJS Note: Originating address only accepts e-mail from list! If replying off- list, change address to asterisk1list at earthshod dot co dot uk .
Zitat von A J Stiles <asterisk_list at earthshod.co.uk>:> On Monday 06 Jul 2015, Luca Bertoncello wrote: >> Well, but for voice quality, which codec is better? >> alaw or gsm? > > A-law is better for voice quality (sorry, thought my original > explanation was > obvious). But note that if the destination is a mobile phone, GSM will be > used anyway, at least for the link between the final cell tower and the > handset.OK, thank you... Maybe will be your explanation other day but mondays obvious... :D So, I think, I should try to force the using of alaw for this phone, is it right? Usually we don't call mobile phones from our landline... Thanks Luca Bertoncello (lucabert at lucabert.de)