[Asterisk-Users] Asterisk and Adtran TA 750 Channel Bank -- odd behavior (help!)

[Gaurav Naik]

Update:

I've determined that the problem is DTMF 9.  I cannot get to  
extension 6950 on the Nortel.  The 9 is totally skipped.  However, if  
I dial 69501, I get connected to extension 6501.  What is so special  
about DTMF 9?

Thanks


On Dec 8, 2005, at 7:40 PM, Gaurav Naik wrote:


> I'm having a strange problem with an analog line connected to an  
> Adtran Channel Bank.  It seems as tho, I cannot make outgoing calls  
> out of the PBX the analog lines are connected to.  I'll explain...
>
> The channel bank has a few analog lines (loop start) coming in to  
> the FXO cards from a Nortel Meridien Option 81c.  I have no  
> administrative/technical control over the Nortel, so I have to  
> believe that the lines are configured correctly (nor are they  
> willing to setup a PRI).
>
> As a start, I terminated one of the analog lines into an analog  
> phone and was able to successfully make and receive calls.  Next, I  
> connected this same line to a X100P and had no problems with  
> Asterisk (other than disconnect supervision).
>
> Finally, I connected the line to the channel bank (channel 1 of the  
> T1).  The T1 between TE110P and the Channel Bank is up -- no  
> errors.  The TE110P is the master, with the 750 as the slave.  I  
> could dial a 4-digit extension number and connect to any station on  
> the Nortel switch (albeit with some echo, but no static).  However,  
> dialing outside of the Nortel doesn't work.
>
> A '9' has to be dialed in order to "get" an outside line.  First, I  
> started with a SIP phone, and setup my dial plan accordingly.   
> Stuck a few No-Ops in there and watched on the console.  Asterisk  
> was correctly dialing 91800XXXXXXXX on the FXO port, however, the  
> Nortel kept ringing extension 1800. Next, I tried adding waits  
> (w9w1800XXXXXXX), but I still keep getting extension 1800. I even  
> tried longer and longer waits. I turned on zap debugging from the  
> asterisk CLI, and could see that DTMF 9 was being sent.  Hmm.   
> Again, with X100P, I could dial outside no problem -- using the  
> SAME dial plan.
>
> In order to make debugging this problem easier, I hooked up the  
> analog phone to one of the FXS ports, and had Asterisk do a native  
> bridge of the two ZAP lines.  Fine, so now I'm hearing the dialtone  
> from the Nortel on my analog set.  I dial '9', there a slight  
> silence (500ms or so) and I get a dial tone.  Correct behavior.   
> Next, I dial 1800XXXX....extension 1800 is ringing.  That didn't  
> work.  I cycled thru about 20 different configurations of  
> zapata.conf and zaptel.conf.  Still doesn't work.  I'm beginning to  
> wonder if there is something wrong with the Adtran.
>
> For a change, I decided to try incoming calls.  Asterisk gets the  
> ring and answers (although it does report something about the line  
> ringing in the wrong state), however, it cannot decode the DTMF  
> digits the caller is dialing.  I dial 813 and Asterisk thinks I  
> dialed 83. My dial plan to setup to report an invalid extension and  
> gives the user another chance to enter the extension.  The second  
> try always works.  (I did this about 5 times, with no problem.)   
> Hmm.  So it gets the wrong DTMF digits the first time, every time.   
> I checked the Digit/Response timeouts...they are set to 5 (for both  
> cases).  I even tried the relaxdtmf directive, but to know avail.   
> Again, I wasn't having these problems on X100P.  The only  
> difference is that the X100P is running Asterisk v1.0.9 and is in  
> an older machine.
>
> I've gone through every configuration directive possible (disabling  
> usecallerid, callprogress, echocancel, etc. etc. ).  I've even  
> tried dialing 9 three times.  Then I pulled out a multi-meter and  
> made sure that Tip and Ring weren't reversed (although that  
> shouldn't make a difference).  I checked zttool for IRQ misses and  
> it reported none.
>
> The dialtone sounds fine (no hiss, pops, or static), but after  
> checking the asterisk/zaptel configuration 25 times, I'm beginning  
> to think its a wiring problem.  Its possible that the 750 isn't  
> grounded correctly..that is probably my next step.
>
> The relevant portions of my current configuration follow.  Any  
> assistance, or hints and tips for debugging this problem are  
> appreciated.
>
> Thanks in advance,
> --
> Gaurav Naik
> ...apologizing for the long e-mail.
>
> *******
> System Config
> --
> Dell Poweredge 1550 server
> Digium TE110P (master clock)
> Adtran TA 750 (slave, and two 4-port FXO cards, and 1 4-port FXS card)
> Asterisk/Zapata v1.2
> RHEL v4.0 Advanced Server
> Polycom/Grandstream SIP Phones
> a few plain old analog phones
>
> /etc/zaptel.conf
> --
> span=1,0,0,esf,b8zs
> fxsls=1
> fxols=9
> loadzone = us
> defaultzone=us
>
>
> /etc/asterisk/zapata.conf (this is version 34325, the simplest one).
> --
> signalling=fxo_ls
> language=en
> context=from-analog-phone
> channel => 9
>
> signalling=fxs_ls
> language=en
> context=from-outside
> channel => 1
>
> Adtran TA 750
> --
> FXO Loop Start (Time Slot 1)
> TX Attenuation 0.0
> RX Attenuation 0.0
>
> All other FXO ports are disabled.  (i've tried it with all the FXO  
> ports enabled as well).
>
> FXS Loop Start (Time Slot 9)
>
>
>
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