Codec Mismatch

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Sometimes in huge call volume am facing this type of error,

[Jun 4 08:42:46] WARNING[8459][C-000079fa]: channel.c:5075 ast_write:
Codec mismatch on channel Local/8038@xss-call-out-00004774;1 setting write format to slin from ulaw native formats (ulaw)
[Jun 4 08:43:04] WARNING[8285][C-000079da]: channel.c:5075 ast_write:
Codec mismatch on channel Local/6513@xss-call-out-00004775;1 setting write format to slin from ulaw native formats (ulaw)
[Jun 4 08:43:10] WARNING[8790][C-00007a2c]: channel.c:5075 ast_write:
Codec mismatch on channel Local/18002662279@xss-call-out-00004778;1 setting write format to slin from ulaw native formats (ulaw)
[Jun 4 08:43:23] WARNING[8355][C-000079e6]: channel.c:5075 ast_write:
Codec mismatch on channel Local/2896@xss-call-out-00004779;1 setting write format to slin from ulaw native formats (ulaw)
[Jun 4 08:43:25] WARNING[7577][C-0000798a]: channel.c:5075 ast_write:
Codec mismatch on channel Local/2896@xss-call-out-0000477a;1 setting write format to slin from ulaw native formats (ulaw)

basically Asterisk will do the slin to ulaw, hope there should not be any problem…

But am not sure why am getting this error? will this affect my call?