SPA3102 и входящие вызовы

Question

Здравствуйте! Настроено всё так: в Line1 введены настройки SIP-подключения до провайдера и в порт Line1 воткнут телефон, с исходящими звонками проблем нет, а вот при попытке поднять трубку звонок разрывается. В чём может быть причина? Прошивка 5.2.13(GW002) Detect Polarity Reversal - no не помогает PS syslog:

<151>SDP RTPMAP 101 --> 136
    192.168.1.2 11/02 20:10:46.100  
<151>CC:pc(0)=0 not in codec list
    192.168.1.2 11/02 20:10:46.105  
<151>SDP RTPMAP 101 --> 136
    192.168.1.2 11/02 20:10:46.110  
<151>[0:0]AUD ALLOC CALL (port=16468)
    192.168.1.2 11/02 20:10:46.112  
<151>[0:0]RTP Rx Up
    192.168.1.2 11/02 20:10:46.113  
<151>[0]Start tone 19(2)
    192.168.1.2 11/02 20:10:46.335  
<151>[0]Start tone 16(2)
    192.168.1.2 11/02 20:10:46.495  
<151>[0]Start tone 10(2)
    192.168.1.2 11/02 20:10:46.655  
<151>[0]Start tone 9(2)
    192.168.1.2 11/02 20:10:46.815  
<151>[0]Start tone 11(2)
    192.168.1.2 11/02 20:10:46.975  
<151>[0]Start tone 9(2)
    192.168.1.2 11/02 20:10:47.135  
<151>[0]Start tone 12(2)
    192.168.1.2 11/02 20:10:47.295  
<151>[0]Start tone 12(2)
    192.168.1.2 11/02 20:10:47.456  
<151>[0]Start tone 16(2)
    192.168.1.2 11/02 20:10:47.615  
<151>[0]Start tone 8(2)
    192.168.1.2 11/02 20:10:47.776  
<151>[0]Start tone 8(2)
    192.168.1.2 11/02 20:10:47.937  
<151>[0]Start tone 21(2)
    192.168.1.2 11/02 20:10:48.095  
<159>[0]Off Hook
    192.168.1.2 11/02 20:10:56.715  
<151>CC:Connected
    192.168.1.2 11/02 20:10:56.849  
<151>[0:0]ENC INIT 8
    192.168.1.2 11/02 20:10:56.850  
<151>[0:0]RTP Tx Up (pt=8->3e94edc9:51266)
    192.168.1.2 11/02 20:10:56.852  
<151>[0:0]RTCP Tx Up
    192.168.1.2 11/02 20:10:56.858  
<134>[0]adp line session start
    192.168.1.2 11/02 20:10:56.862  
<134>[0]adp line session start
    192.168.1.2 11/02 20:10:56.866  
<151>CC:Ended
    192.168.1.2 11/02 20:10:56.892  
<159>[0]FM Alert Stop RxTx (c=0024e22c;a=0)
    192.168.1.2 11/02 20:10:56.896  
<151>[0:0]AUD Rel Call
    192.168.1.2 11/02 20:10:56.901  
<134>[0]adp line session stop
    192.168.1.2 11/02 20:10:56.906  
<134>[0]adp line session stop
    192.168.1.2 11/02 20:10:56.910  
<134>--------------------------
    192.168.1.2 11/02 20:10:56.914  
<134>--------------------------
    192.168.1.2 11/02 20:10:56.917  
<134>[0] duration:0 s
    192.168.1.2 11/02 20:10:56.921  
<134>[0] duration:0 s
    192.168.1.2 11/02 20:10:56.925  
<134>path:nb_in, did:50, start at 427 s
    192.168.1.2 11/02 20:10:56.929  
<134>path:nb_in, did:50, start at 427 s
    192.168.1.2 11/02 20:10:56.933  
<134>path:nb_out, did:51, start at 427 s
    192.168.1.2 11/02 20:10:56.937  
<134>path:nb_out, did:51, start at 427 s
    192.168.1.2 11/02 20:10:56.940  
<134>path:full, did:52, start at 427 s
    192.168.1.2 11/02 20:10:56.944  
<134>path:full, did:52, start at 427 s
    192.168.1.2 11/02 20:10:56.947  
<134>--------------------------
    192.168.1.2 11/02 20:10:56.951  
<134>--------------------------
    192.168.1.2 11/02 20:10:56.954  
<159>[0]On Hook
    192.168.1.2 11/02 20:11:03.334