Why can't I dial international numbers with 14 digits?

The FLEN length associated with Special Numbers (SPNs) can cause calls to fail. International numbers can be of varying length these days. An SPN may deal with several regional numbers. Some may work and others don't. The difference is usually the number of digits in the number. Some have 14 others may be 15 or more.
Print the SPN list using LD 90.

TYPE  SPN (Press the return key to see the listing.)

You may see for example SPN 00 with the FLEN value of 14.

As this SPN covers all international numbers, there isn't any flexibility to deal with number of digits. A better way is to expand the SPN listing for international call from 00 to include 001, 002, 003, 004, 005, 006, 007, 008 and 009.

So for example calls to 001 could have FLEN = 14 digits but 002 could have FLEN= 15. But there could be some variation of number length in regional numbers.

For example there could be a mixture of 14, 15 and 16 digits in code 005. This may need to be expanded so there would be SPNs 0051, 0052, 0053, 0054 and so on to allow specific FLEN settings for each code.

If you are sure the FLEN setting is correct there is another check to be made.

Calls to international and mobile numbers, for example, often have a long set up time. If an ISDN 30 trunk route uses DASS2 or DPNSS signalling check the RMA timer setting.

Use overlay LD 21.

ROUT  (Enter the route number.)
The timers are listed in this print.

Check that RMA is set to a value of 20480. It may be set to 5120. That is often too short to allow the call to be set up.

Use overlay LD 16 to change it to 20480.

Only trained system administrators can make these changes:
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