In Brazil, calls may be paid by called user.
In R2, OXE is ready to Denied or allow collect calls by COS or TrunkGroup.
ISDN still not implemented. Above we can find collect call trace.
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| (808938:000025) Concatenated-Physical-Event :
| long: 53 desti: 0 source: 0 cryst: 2 cpl: 6 us: 0 term: 0 type a5
| tei: 0 >>>> message received : SETUP [05] Call ref : 12 c5
|SENDING COMPLETE
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| IE:[04] BEARER_CAPABILITY (l=3) 80 90 a3
| IE:[18] CHANNEL (l=3) a1 83 9c -> T2 : B channel 28 preferred
| IE:[4a] UNKNOWN (l=1) 81
| IE:[6c] CALLING_NUMBER (l=12) -> 21 83 Num : 9191374488
| IE:[70] CALLED_NUMBER (l=5) -> c1 Num : 3046
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| (808938:000026) 1344: Send_IO1 (link-nbr=1, sapi=0, tei=0) :
| long: 26 desti: 0 source: 15 cryst: 2 cpl: 6 us: 8 term: 0 type a5
| tei: 0 <<<< message sent : STATUS [7d] Call ref : 92 c5
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| IE:[08] CAUSE (l=3) 81 e3 4a -> [e3]
| INFORMATION ELEMENT NON-EXISTENT OR NOT IMPLEMENTED
| IE:[14] CALL_STATE (l=1) 06
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| (808938:000027) 1344: Send_IO1 (link-nbr=1, sapi=0, tei=0) :
| long: 23 desti: 0 source: 15 cryst: 2 cpl: 6 us: 8 term: 0 type a5
| tei: 0 <<<< message sent : CALL PROC (02) Call ref : 92 c5
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| IE:[18] CHANNEL (l=3) a9 83 9c -> T2 : B channel 28 exclusive
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| (808938:000028) 1344: Send_IO1 (link-nbr=1, sapi=0, tei=0) :
| long: 22 desti: 0 source: 15 cryst: 2 cpl: 6 us: 8 term: 0 type a5
| tei: 0 <<<< message sent : ALERT (01) Call ref : 92 c5
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| IE:[1e] PROGRESS_ID (l=2) 81 88
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| (808959:000029) 1344: Send_IO1 (link-nbr=1, sapi=0, tei=0) :
| long: 30 desti: 0 source: 15 cryst: 2 cpl: 6 us: 8 term: 0 type a5
| tei: 0 <<<< message sent : CONNECT (07) Call ref : 92 c5
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| IE:[4c] CONNECTED_NUMBER (l=10) -> 01 81 Num : 33483046
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