I just upgraded to Asterisk 1.4.24 and had some echo issues that were not there with 1.4.20. Reading further I found that I need to edit the system.conf file to add software echo cancellers mg2, kb1, sec2, and sec. However, when running the DAHDI config script, I get this error:
DAHDI_ATTACH_ECHOCAN failed on channel 1: Invalid argument (22)
Does that mean the echo cancellers were not compiled with dahdi-tools or does my TDM400P card not support it with the wctdm driver?