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

[Gaurav Naik]

I just wanted to follow up with the solution for the searchable  
archives.

To summarize: Adtran TA 750 w/ FXO lines from a Nortel Meridien
Problem: DTMF digits not being decoded properly
Solution: Set the TX/RX Attenuation on the TA750 to 9.0db (max)

The sound is a little low now, but DTMF is working properly.

-gn

On Dec 9, 2005, at 12:56 PM, Gaurav Naik wrote:

> 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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