09-11-2002 12:09 AM - edited 03-12-2019 08:43 PM
I have a question about Fax transmission over IP networks. If I configure as the following, what will be the FoIP packet size? I mean, what will be the compressed fax_data packet size?
Let the default codec is g729a (8Kbps>>12Kbps in real). And the fax call comes from voice port 1/0/0. I assume that the voice port adaptively decide on the incoming calls that the call is a voice conversation or the call is a fax message. Correct??
**************************************
!
hostname NM_A_3640
ip subnet-zero
!
voice service voip
fax protocol t38 ls-redundancy 0 hs-redundancy 0
h323 call start fast
!
!
dial-peer voice 10 pots
destination-pattern 2222
port 1/0/0
!
dial-peer voice 20 voip
destination-pattern 4444
fax rate 144400
session target ipv4:10.1.1.100
!
**************************************
Thanks,
Onur DC
09-12-2002 04:14 AM
When the call is turned to fax mode will use fax ... settings.
For fax relay through G729 codec (8k) the rate must be according this codec. I use fax rate 7200 for g729r8 codecs.
Also i use the followin parameters to ensure fax quality:
fax rate 7200 ! speed setting g729
fax nsf 000000 ! Disable NonStandar negotiation
fax-relay ecm disable ! Disable Error Correction Mode
Regards
Ezequiel Colombo
09-12-2002 04:30 AM
Thanks for your aid about quality parameters, I will try.
If the voice port is capable of differentiating in between the fax_call & voice_call, speed of 7200 will seem to work as you mentioned.
Have a nicer day,
Onur DC
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