Q.SIG anti-tromboning transfer from IVR 1

[Onefunnydude]

Hi all,
We have an IVR connected to a client's MD110 (BC12) through four ISDN PRI trunks, with callers currently returned to ACD groups on the MD110 through tromboned calls (calls made back from IVR to MD110 on a different B-channel. We'd like to adapt it so that these calls no longer trombone, but have the MD110 connect the inbound and outbound legs, freeing up two circuits after the transfer has taken place.
We've tried coding ECMA-178 Call Transfer, but without success, using Q.SIG. I suspect the problem may be related to ISO vs. ECMA versions of Q.SIG?
We know from our local MD110 vendor that path replacement does work with DPNSS, but we'd like to avoid using DPNSS if possible.
What is the best recommended way of achieving our goal? We've also considered using CTI via ApplicationLink, but it appears digital trunks cannot be controlled that way; it only allows control of extensions, or CAS channels.
Any recommendations/advice of how this transfer/path optimization may be implemented will be highly appreciated!

 

[TripleT]

You could use Path Replacement on QSig.

ASPAC 223 will allow this as long as you have the othe Route Optimisation ASPAC's set as they would normally do.

We have this working here to a Teleware IVR / Voicemail System.

 

[Onefunnydude]

Thanks for that valuable feedback! I'm not familiar with the ASPAC; could you please elaborate what actions are required from the IVR's side in order to initiate the Route Optimisation?

 

[TripleT]

ASPAC 223 was introduced as part of BC11.

It basically is used to decide if you want to use Ericsson Proprietary UUS in your Network or International ISO QSIG for the following 3 Services.

Value 1 = Call Forwarding
Value 2 = Call Transfer
Value 4 = Path Replacement

So the ASPAC can be set from 0 to 7.

If set to 0 all services are UUS.
If set to 3 (1+2) Call Forwarding and Call Transfer are ISO with Path Replacement as UUS.
If set to 7 (1+2+4) all services use ISO.

***Word of warning.***
If you have a Network, you must have all PABX's set the same. You cannot have the ASPAC Set differently in PABX's on the Same QSig Network.

As far as what needs to be done in the IVR. Not Much. You just need to ensure that the IVR has routing to the Exchange ID of the MD110.