TG800 SIP/2.0 603 Declined

If in "SIP to GSM" route configuration I use Caller ID with special characters, received BUSY signal and ''SIP/2.0 603 Declined'' - SIP message in debug. For example Caller ID 7XX, 7[0-3]0, XXX. I'm calling from a number 710. If I change it to explicite  Caller ID 710 - get a successful connection. Tried two firmware versions, now -






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