T30 fax protocol over pstn

[chancal]

Hello everyone,

So i have this Mauritius number that i need to fax to. I am dialing from Canada so i dial 011 230 XXX XXXX.
From a digital phone from my Option 11 i dial the number and it can connect to a fax tone.
From a fax machine off an analog line off the same pbx i dial the number and can hear a fax tone but the fax does not send successfully.
From a fax machine off a standalone analog line at a different site, i dial, can hear a fax tone, but fax does not send successfully.
From yet another fax machine at a different site, i dial,can hear a fax tone and can send successfully.

So my question is, why can i not fax from those 2 particular fax machines?

I have read up on the t30 pstn fax standards and it seems pretty basic, it should "just work".

I have also printed out on the Option 11, the ld 90 SPN and do see the 011 entry. However, i print out the nxx and do not see any entries at all. Could that be the reason why? but that would not make sense as i am able to fax to the UK no problem AND i am able to dial it from the digital phone even without a 230 nxx entry.

Any one ever experience issues in faxing due to machine to machine incompatibities?

thank you

 

[johnpoole]

it can't be ld 90 if the fax machine answers.. ld 90 would give you a atb at the fail point.. could be a vce vod mismatch.. i would look at the ld provider in each case, the station that works has the one ld provider that is doing one step right..

you didn't mention trunk type, t1,pri,analog,voip? that could be determining factor as well. i had some problems with getting fax from manual fax machines that required a patch in my cp.. but that was rls 3 or before

john poole
bellsouth business
columbia,sc