Dear Nipun and Narinder,
Sorry that I did not answer before. We had an external guy here yesterday for another topic and we used the time and asked him regarding this issue.
Before this, we checked if we had any slips. And we really had some Slip secs. So we played a bit with the clock configuration until this was stable.
Then we tested:
dial-peer voice 500 voip fax protocol t38 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw fax-relay ecm disable
fax nsf 000000 fax-relay sg3-to-g3
This did also not work.
Then the external had the idea to change the fax protocol with version 3.
So now the dialpeer looks like this:
dial-peer voice 500 voip description SIP to CUCM preference 1 destination-pattern +350200025.. session protocol sipv2 session transport tcp session server-group 100 voice-class codec 10 voice-class sip options-keepalive profile 100 voice-class sip bind control source-interface Loopback0 voice-class sip bind media source-interface Loopback0 dtmf-relay rtp-nte sip-notify fax-relay ecm disable fax-relay sg3-to-g3 fax rate 9600 fax nsf 000000 fax protocol t38 version 3 ls-redundancy 0 hs-redundancy 0 fallback pass-through g711ulaw no vad
And this FINALLY WORKS! Incredible how hard this was!
Thanks to both of you for all the support! :)
... View more