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fixed error in SDP when rejecting T.38, if multiple media sections were offered
- fixed problem on SIP->FXO calls accidentally terminating FXO->SIP call on used port
- fixed potential resource leak of RTP ports on SIP->SIP calls handling
- for SIP->SIP calls, dtmfmode can be configured for both SIP legs individually
- new options for s2s_nat_opener
- added GUI options for ppi_username, pai_username, s2s_nat_opener and use_privacy_header settings
- qvalue can be configured for registrations
- configured ton is considere when calculating new_source_auto and new_source_destination for SIP→ISDN calls
- better handling of certificates
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