[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 < TEI=0 Call Ref: len= 2 (reference 6918/0x1B06) (Sent
    from originator)
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 < Message Type: RELEASE COMPLETE (90)
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 < [08 02 80 af]
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 < Cause (len= 4) [ Ext: 1  Coding: CCITT (ITU)
    standard (0)  Spare: 0  Location: User (0)
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 <  Ext: 1  Cause: Resource unavailable, unspecified
    (47), class = Network Congestion (resource unavailable) (2) ]

My guess is your provider did not have a free voice channel to pass audio at some leg in the call. There could be multiple legs in the call and one of them had 'Network Congestion'.

    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 Received message for call 0xb750d598 on link 0x9b33f2c
    TEI/SAPI 0/0
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 -- Processing IE 8 (cs0, Cause)
    [Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c: [Jan 14 12:56:04]
    PRI Span: 4 q931.c:8567 post_handle_q931_message: Call 6918 enters
    state 0 (Null).  Hold state: Idle
    [Jan 14 12:56:04] VERBOSE[13262] sig_pri.c: [Jan 14 12:56:04] Span
    4: Processing event PRI_EVENT_HANGUP
[Jan 14 12:56:04] VERBOSE[13262] sig_pri.c: [Jan 14 12:56:04] -- Span 4: Channel 0/2 got hangup, cause 47


Richard





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