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cat /sys/devices/system/clocksource/clocksource0/current_clocksource
cat /sys/devices/system/clocksource/clocksource0/available_clocksource

2014-06-25 20:58:59.471051 [INFO] ftmod_zt.c:673 Disable echo cancel for 1:1
2014-06-25 20:58:59.471051 [DEBUG] mod_freetdm.c:403 Set codec PCMU 20ms
b3d16542-58b3-4a83-9e05-013dca87d4e4 2014-06-25 20:58:59.471051 [DEBUG] mod_freetdm.c:1251 Connect outbound channel FreeTDM/1:1/304100

2014-06-25 20:59:02.171049 [INFO] switch_ivr_originate.c:3501 Sending early media 7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:3469 Audio Codec Compare [PCMA:8:8000:20:64000:1] [PCMA:8:8000:20:64000:1]
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:3523 Audio Codec Compare [PCMA:8:8000:20:64000:1] ++++ is saved as a match
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:3394 Set telephone-event payload to 101
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:2352 Set Codec sofia/internal/153@pbx PCMA/8000 20 ms 160 samples 64000 bits 1 channels
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_codec.c:111 sofia/internal/153@pbx Original read codec set to PCMA:8
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:3714 Set 2833 dtmf send/recv payload to 101
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_core_media.c:4934 AUDIO RTP [sofia/internal/153@pbx] 187.261.284.27 port 28128 -> 192.168.2.104 port 4006 codec: 8 ms: 20
7f56ce4e-dcf1-4766-a217-dff1e6467b49 2014-06-25 20:59:02.171049 [DEBUG] switch_rtp.c:3382 Starting timer [soft] 160 bytes per 20ms

<action application="bridge" data="{absolute_codec_string='PCMA'}freetdm/1/a/${destination_number}"/>

switch(codec) {
        case FTDM_CODEC_ULAW:
                {
                        dname = "PCMU";
                }
            break;
        case FTDM_CODEC_ALAW:
                {
                        dname = "PCMA";
                }
            break;
        case FTDM_CODEC_SLIN:
                {
                        dname = "L16";
                }
            break;

<param name="outbound-bearer_layer1" value="alaw"/>