[asterisk-ss7] why

Matthew Fredrickson creslin at digium.com
Fri Sep 12 12:21:29 CDT 2008 

olivier taylor wrote:
> what do you mean by a better software echo canceller?
> I use the standard one in dahdi, wich is better?
> Oslec doesn't seems available for dahdi.

OSLEC was what I was thinking of... although whether or not there is a 
patch for DAHDI to use OSLEC I do not know.

> In fact the problem came when I needed G729, not supported and not 
> available by Digium for trunk and 1.6

1.6.0 will be released soon, so you definitely will have one then.  I'm 
not sure whether or not they have a 1.6 pre-release of the g.729 binary. 
  I'll look into this.

Matthew Fredrickson
Digium, Inc.

> I tried to install the last version of asterisk, libss7, and dahdi.
> Since, I have echo problem I didn't had before.
> 
> 
> Olivier
> 
> Matthew Fredrickson a écrit :
>> olivier taylor wrote:
>>> echocancel is set, the exact message is :
>>
>> Ok, this means that you either need to try to use a different/better 
>> software echo canceller or you need to get a hardware echo canceller 
>> that will perform better.  Thanks for checking that, we just had a 
>> problem a while ago where the echo canceller wasn't being turned when 
>> calls came in (in a particular scenario) and I wanted to make sure 
>> that that wasn't happening again.
>>
>> Matthew Fredrickson
>> Digium, Inc.
>>
>>>
>>> uu212-190-xx-xxx*CLI> dahdi show channel 2
>>> Channel: 267-183*CLI>
>>> File Descriptor: 22
>>> Span: 1
>>> Extension: 7-183*CLI>
>>> Dialing: no
>>> Context: default
>>> Caller ID:
>>> Calling TON: 0
>>> Caller ID name:
>>> Mailbox: none
>>> Destroy: 0
>>> InAlarm: 0
>>> Signalling Type: SS7
>>> Radio: 00-67-183*CLI>
>>> Owner: DAHDI/2-1
>>> Real: DAHDI/2-1 (Linear)
>>> Callwait: <None>
>>> Threeway: <None>
>>> Confno: -1
>>> Propagated Conference: -1
>>> Real in conference: 0
>>> DSP: yes
>>> Busy Detection: no
>>> TDD: no
>>> Relax DTMF: no
>>> Dialing/CallwaitCAS: 0/0
>>> Default law: alaw
>>> Fax Handled: no
>>> Pulse phone: no
>>> DND: no
>>> Echo Cancellation:
>>>    128 taps
>>>    currently ON
>>> CIC: 2
>>> Actual Confinfo: Num/0, Mode/0x0000
>>> Actual Confmute: No
>>> Hookstate (FXS only): Onhook
>>>
>>>
>>> Matthew Fredrickson a écrit :
>>>> olivier taylor wrote:
>>>>>
>>>>>
>>>>> Matthew Fredrickson a écrit :Well, I am quite happy with libss7, no 
>>>>> real reasons to change for me.
>>>>> But, I can't be sure and this is another problem, since I use 
>>>>> chan_dadhi, I have big echo problems, it wans't the case with zaptel.
>>>>> I am buying E1 cards with hardware echo canceller to avoid this 
>>>>> problem because I didn't find any solution with Dahdi.
>>>>> Tuning by rxgain/txgain makes the echo a bit better, but an echo 
>>>>> still remain.
>>>>
>>>> I think I might have mentioned this in another email, so please 
>>>> forgive me if I did, but when you have a call up with echo on it, 
>>>> can you check `dahdi show channel x` where is is the DAHDI channel 
>>>> that you are connected to and tell me if the echocancel: option is 
>>>> set to something besides no?
>>>>
>>>> Thanks,
>>>> Matthew Fredrickson
>>>> Digium, Inc.
>>>>
>>>>>
>>>>> Dunno if I am the only to have that problem.
>>>>>
>>>>> Kind regards,
>>>>>
>>>>> Olivier
>>>>>> Krzysztof Drewicz wrote:
>>>>>>  
>>>>>>> Oakland, Alan napisał(a):
>>>>>>>  
>>>>>>>> To further clarify, libss7 is developed by Digium, where 
>>>>>>>> chan_ss7 is
>>>>>>>> developed by a company called Dicea, more information on 
>>>>>>>> chan_ss7 can be
>>>>>>>> found on it's voip-info page
>>>>>>>> http://www.voip-info.org/wiki/view/Asterisk+ss7+channels
>>>>>>>>         
>>>>>>> Also:
>>>>>>>
>>>>>>> chan_ss7 by Dicea has a cluster/failover capability where you 
>>>>>>> have one SPC for you asterisk (one point code in SS7, just like 
>>>>>>> one IP), and if used with 2 hosts, each one having at least one 
>>>>>>> E1 to your SS7 peer , then (if your peer understands changeover 
>>>>>>> and emergency changeover messages it's 99.99%)  one of your 
>>>>>>> asterisk machines could do a reboot, and a second one will go on.
>>>>>>>     
>>>>>>
>>>>>>
>>>>>>  
>>>>>>> libss7 has (am i correct) no official support, in other words: 
>>>>>>> you cannot expect Digium Support (even with Asterisk Premium 
>>>>>>> Edition) to solve your problems with libss7, they will help, but 
>>>>>>> the response time etc... for ss7 is not in the contract.
>>>>>>>     
>>>>>>
>>>>>> Regarding the current "official" support channel for libss7, this 
>>>>>> is certainly no worse off than the lack of an official support 
>>>>>> channel for chan_ss7.  And with libss7 you get the benefit that 
>>>>>> the original author (myself) is still actively maintaining and 
>>>>>> supporting it, as well as working with many of you in the 
>>>>>> community with any problems you run into.
>>>>>>
>>>>>> There are still some policies and decisions we have to make about 
>>>>>> how we're going to officially support libss7 though.  I believe 
>>>>>> that when we make the official release of Asterisk-1.6.0 (Open 
>>>>>> source) installation support will be something you can call 
>>>>>> support about (although it'll probably end up coming back to me 
>>>>>> for a while, while the technical support staff are learning how to 
>>>>>> support it).
>>>>>>
>>>>>> With regards to BE, I was asked a while ago about including libss7 
>>>>>> support in it.  At the time (this was probably a year or year and 
>>>>>> half ago), I thought it wouldn't be a good idea, due to maturity 
>>>>>> issues.  Now though, I feel that libss7 is to the point where I 
>>>>>> would feel good about putting it in BE since, IMHO, it has been 
>>>>>> proven as far as stability and performance goes.
>>>>>>
>>>>>> If there is enough interest in getting support for libss7 (i.e. 
>>>>>> people would be willing to buy copies of it to use with libss7) I 
>>>>>> can look into what it would take to get it in.
>>>>>>
>>>>>> -- 
>>>>>> Matthew Fredrickson
>>>>>> Digium, Inc.
>>>>>>
>>>>>> _______________________________________________
>>>>>> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>>>>>>
>>>>>> asterisk-ss7 mailing list
>>>>>> To UNSUBSCRIBE or update options visit:
>>>>>>    http://lists.digium.com/mailman/listinfo/asterisk-ss7
>>>>>>
>>>>>>   
>>>>>
>>>>> ------------------------------------------------------------------------ 
>>>>>
>>>>>
>>>>> _______________________________________________
>>>>> --Bandwidth and Colocation Provided by http://www.api-digital.com--
>>>>>
>>>>> asterisk-ss7 mailing list
>>>>> To UNSUBSCRIBE or update options visit:
>>>>>    http://lists.digium.com/mailman/listinfo/asterisk-ss7
>>>>
>>>>
>>>
>>
>>
>

More information about the asterisk-ss7 mailing list