[asterisk-ss7] why

[olivier taylor]

echocancel is set, the exact message is :

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.
>>>
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>>>   
>>
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