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    <blockquote
cite="mid:CALD46g1nNLKCqoTNz-mh_qy_TtzUt0ArxKs8+13JEguO=eYE-Q@mail.gmail.com"
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                  <div>[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)</div>
                  <div>[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c:
                    [Jan 14 12:56:04] PRI Span: 4 < Message Type:
                    RELEASE COMPLETE (90)</div>
                  <div>[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c:
                    [Jan 14 12:56:04] PRI Span: 4 < [08 02 80 af]</div>
                  <div>[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)</div>
                  <div>[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) ]</div>
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    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'. <br>
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cite="mid:CALD46g1nNLKCqoTNz-mh_qy_TtzUt0ArxKs8+13JEguO=eYE-Q@mail.gmail.com"
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                    [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</div>
                  <div>[Jan 14 12:56:04] VERBOSE[13262] chan_dahdi.c:
                    [Jan 14 12:56:04] PRI Span: 4 -- Processing IE 8
                    (cs0, Cause)</div>
                  <div>[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</div>
                  <div>[Jan 14 12:56:04] VERBOSE[13262] sig_pri.c: [Jan
                    14 12:56:04] Span 4: Processing event
                    PRI_EVENT_HANGUP</div>
                  <div>[Jan 14 12:56:04] VERBOSE[13262] sig_pri.c: [Jan
                    14 12:56:04]     -- Span 4: Channel 0/2 got hangup,
                    cause 47</div>
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            <div>Richard<br>
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    <pre class="moz-signature" cols="72">-- 
Technical Support
<a class="moz-txt-link-freetext" href="http://www.cellroute.net">http://www.cellroute.net</a></pre>
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