When are having some blocking calls when the phone is forwarded to an external number and called from an internal phone.
John's phone is forwarded to 9-1-AAA-AAA-XXXX. Jane calls his phone by dialing 4 digit and Jane get a timeout tone. We did ISDN Q931 in the router and it is showing that the number that is being sent is only 4 digit (Invalid number format (incomplete number)).
Jane can call directly 9-1-AAA-AAA-XXXX and the router will show the call is sending 10 digit or complete number.
It is also happening when we have a route pattern.
We have 9411 to be routed to 1800GOOG411. The call will fail to since it is only sending the 4-dgit number from where the callers call 411. The debug also shows that the sending digit is only 4 digit instead 10 digit.
In the other side, we can call 1800GOOG411 directly from any phones.