[asterisk-users] any experience with cisco media gw with fax???

[Jared Mauch]

FYI: I have T.38 disabled and have found the delay/jitter acceptable in our environment over the network with g711ulaw passthrough.

- Jared

On Apr 16, 2011, at 11:28 AM, Oguzhan Kayhan wrote:

> Hello, thanks or the quick replies.
> I tried with both 1.6.2.9 and 1.6.2.17
> My config is sipaxclient-asterisk-(siptrunk)-telcooperator-analogfax
> 
> All i know is telco uses cisco on their side..Not sure which version they
> are using.
> 
> I got t38pt_udptl = yes parameter on sip.conf general.
> Didnt make any other special settings or trunk config itself.
> 
> On monday, i better run a debug on sip protocol and paste what errors do i
> have on that..
> PLus if i can manage i will ask for version info about telco side.
> Thank you.
> 
> 
>> 
>> On Apr 16, 2011, at 9:27 AM, Steve Underwood wrote:
>> 
>>> On 04/16/2011 01:24 PM, Oguzhan Kayhan wrote:
>>>> Hello,
>>>> We have a sip trunk end point with cisco media gateway.
>>>> VoIP works fine.
>>>> But when we try to send faxes thru this trunk, we simply can not.
>>>> 
>>>> Is there anybody experienced such problem and solved?
>>>> How should i set sip.conf and udptl.conf.
>>>> 
>>>> I already have t38pt_udptl=yes in sip.conf
>>>> 
>>>> Thank you.
>>> How old is the Cisco software? It appears they completely changed their
>>> T.38 software platform a couple of years ago. Before that is was awful.
>>> I wasted a lot of time, while developing my T.38 platform, hunting down
>>> problems that turned out to be broken Ciscos. Since the new software has
>>> spread into the field, the complaints have largely gone away.
>> 
>> 
>> I have the following in my dial-peers, but *KEEP IN MIND*, for calls
>> placed to a POTS dial-peer on a Cisco, it won't do 'fax rate disable'
>> etc.. on that side of the session if the origin doesn't match a dial peer
>> as well, so it may be worthwhile to have a high priority (catchall) peer
>> that has something like .T as the pattern with your catch-all parameters.
>> 
>> PBX TIE:
>> 
>> dial-peer voice 7700 pots
>> answer-address 77..
>> destination-pattern 77..
>> fax rate disable
>> port 0/0/0:23
>> prefix 77
>> !
>> 
>> Asterisk PEER:
>> 
>> dial-peer voice 1000 voip
>> preference 1
>> answer-address 1...
>> destination-pattern 1...
>> session protocol sipv2
>> session target ipv4:10.0.0.1
>> session transport udp
>> dtmf-relay rtp-nte
>> codec g711ulaw
>> fax-relay ecm disable
>> fax rate disable
>> fax protocol pass-through g711ulaw
>> no vad
>> !
>> 
>> DID Setup:
>> 
>> dial-peer voice 214915135 voip
>> destination-pattern 214915135.
>> session protocol sipv2
>> session target ipv4:10.0.0.1
>> session transport udp
>> dtmf-relay rtp-nte
>> codec g711ulaw
>> fax-relay ecm disable
>> fax rate disable
>> fax protocol pass-through g711ulaw
>> no vad
>> !
>> dial-peer voice 1350 pots
>> incoming called-number 214915135.
>> fax rate disable
>> direct-inward-dial
>> !
>> 
>> 
>> 
>> 
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> 
> 
> 
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