CallThru Dialing Problem

Hello,

I am able to get a dial tone when I dial an incoming number registered on PBXes.

The only problem I face is that when I dial a bank or anyother number that requires numerical inputs, the data I punch in using my dial pad always goes incomplete or incomplete.

I tried chaning DTMF modes but still nothing helps.

At times I am not able to dial using the CallThru service. When I get the dial tone, I have to keep pressing my first number till the dial tone doesn't go. Then I dial the rest of my number.
It is strange that why it is only the first number that it takes a while to go through.

Please help.

Thanks

RE: CallThru Dialing Problem

When you dial a PSTN number which is linked to an IVR the DTMF digits are being transmitted to the IVR via one of your ITSPs trunks.

The last element transmitting the DTMF digits, is the VoIP to PSTN gateway belonging to the ITSP or his upstream termination provider. PBXes takes the DTMF digits your SIP User Agent sends and passes them on to the ITSP's SIP Proxy.

In order to diagnose where the issue lies, you should let us know what kind of SIP User Agents (IP-phone, ATA, soft-phone) you have, as well as the ITSP you terminate the call through.

RE: CallThru Dialing Problem

Hello,

Thanks for replying to my post.

If I understood the correct meaning of ITSP, then I am using sipsorcery.com.

Let me explain you my calling process.

I dial a number that is registered onto to PBXes. The provider is worldline.ca.

PBXes picks up the call and gives me a dial tone to dial. Now my first problem is here. When I try dialing the number, PBXes doesn't seem to take the first number as I still here the dial tone. To make things easy lets say I am dialing 0123456789.

I have to keep on pressing '0' till the dial tone doesn't go away and then I dial all the other numbers without repeating them.

I also noticed that this problem occurs on some phones, while some phones are perfectly fine. On the other hand, at times the phones that didn't have this problem suddenly start having this problem.

When I successfully punch in my destination number, PBXes uses one of my Trunks to dial. I use worldline.ca as the provider directly and not the sipsorcery trunk.

When the call is answered and if its a bank or any other numerical answering system, it doesn't seem to take all my digits. So if i punch in 1234567, it might take 2567, or some other random numbers from above.

Thank you

RE: CallThru Dialing Problem

Let me define the meaning of the ITSP (Internet Telephony Service Provider) term, which is very similar if not identical with the VSP (Voice Service Provider) term.

Since we live in a transitional period, there are two kind of telephony worlds. The OnNet and the OffNet. The OnNet world comprises of all the elements which are interconnected via packet networks, whereas the OffNet world is comprised of all the network elements which are interconnected over circuit networks.

Typically, an ITSP or VSP is a provider which facilitates the delivery of voice calls to and from OffNet networks like the PSTN. Some ITSPs / VSPs facilitate call delivery to certain OnNet networks as well, but their main revenue generator is their call termination & origination services to & from the PSTN.

So in your case, worldline.ca qualifies as an ITSP / VSP whereas sipsorcery.com does not, since they provide a SIP aggregation service according to their website, a service similar to PBXes.

Regarding your issue, when a call reaches your worldline.ca DID from a PSTN phone (landline or cell), the DTMF digits have to be captured from worldline.ca's PSTN gateway (or their upstream provider), converted to an appropriate format (ideally RFC2833) and then transmitted to PBXes' SIP Proxy. If the capture and conversion is not done properly, the DTMF digits will never be transmitted properly to PBXes and therefore recognized and acted upon as you expect them to.

As such, the chain of events starts there, therefore your investigation should begin there too. If the DTMF digits are transmitted properly from worldline.ca's side, to a regular SIP UA (ATA, IP-phone, soft-phone) verified by a packet trace, we can help you troubleshoot the transmission to the next link in the chain.

Regarding the reasons why RFC2833 is the preferable DTMF transmission method, you can take a look at DTMF settings on extension which outlines the available options, along with their pros and cons.

RE: CallThru Dialing Problem

Thanks for your reply.

I looked into it and tried different DTMF.

I think it also depends on the phone cause some phones don't have any problems when DTMF is set on auto.

While changing this or maybe someother setting, there is a problem now.

Whenever I call into my trunk registered at PBXes, and I use CallThru to dial a number using another trunk, I get an error 'This account is already in use, if you think this is an error, contact your admistrator'. The message is somewhat like that. It seems that PBXes is giving that error cause of the sound I usually here when I dial an invalid number.

Please help me resolve this issue.

Thank you