The default codec is PCMU. Both PCMU and PCMA can give you a excellent sound quality, however they waste more bandwidth resources. Certainly, you can also choose other lower-bit-rate codecs, if the network bandwidth is low.
For more information, please refer to Administrator Guide or the corresponding user manual.
Product type: SP-R50(P), SP-R52(P), SP-R53(P) and SP-R59(P)