[asterisk-r2] Looks like Oi/Brasil Telecom is not signalling collect calls anymore?

[Moises Silva]

On Fri, Aug 7, 2009 at 11:28 AM, Norman Schmidt
<norman at omegatecnologia.com>wrote:

> During months, the collect call blocking capabilities of OpenR2 were
> working
> like a charm, using it with Asterisk 1.4.21.2, Zaptel 1.4.12.1 and OpenR2
> 1.1.0.
>
> Suddenly, some days ago all E1 R2 trunks we have with Oi (ex-Brasil Telecom
> here) started to accept collect calls. These calls are passing thru not
> signalled as collect calls anymore:
>
>
That indeed suggest your telco is the one to blame, since they changed
something.



> I tried "mfcr2_double_answer=yes", but then:
>
> [Aug  7 11:54:52] NOTICE[9472]: chan_zap.c:961 zt_r2_on_call_init: New
> MFC/R2 call detected on chan 1.
> [Aug  7 11:54:57] WARNING[9472]: chan_zap.c:1199 zt_r2_write_log: Chan 1 -
> MF back cycle timed out!
> [Aug  7 11:54:57] ERROR[9472]: chan_zap.c:1202 zt_r2_write_log: Chan 1 -
> Protocol error. Reason = Multi Frequency Cycle Timeout, R2 State = Seize
> ACK
> Transmitd, MF state = Category Request Transmitted, MF Group = Backward
> Group A, CAS = 0x00
> DNIS = 0, ANI = , MF = 0x30
> [Aug  7 11:54:57] ERROR[9472]: chan_zap.c:1012 zt_r2_on_protocol_error:
> MFC/R2 protocol error on chan 1: Multi Frequency Cycle Timeout
> [Aug  7 11:55:02] NOTICE[9472]: chan_zap.c:1225 zt_r2_on_line_idle: Far end
> unblocked on chan 1
>

However, adding mfcr2_double_answer does not may cause any protocol error
due to MF cycle timeout, this is something else going on and we need a call
file log in order to tell more about it.



>
> Can I start to blame/curse Oi/Brasil Telecom only, or do I have any
> alternatives? Do someone else here on (south of) Brazil facing similar
> problems with ex-Brasil Telecom E1 trunks (now "Oi")?
>
> Norman


The only 2 ways to block collect calls is double answer and proper tagging
of collect calls via special tone, if none of those 2 work you cannot block
them. Call your telco :-)

-- 
Moises Silva
Software Developer
Sangoma Technologies Inc. | 50 McIntosh Drive, Suite 120, Markham ON L3R 9T3
Canada
t. 1 905 474 1990 x 128 | e. moy at sangoma.com
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