[kamailio/kamailio] add rport to uac register msg (#2639) - sr-dev

16 Feb 2021

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### Description

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Sometimes need to add rport on outbound uac reg, but seems it's not possible in the
current uac module. Would be good to an an extra param to do it, or is it possible to
trigger a KEMI event route so a script can add whatever it need before sending the
register msg?

Thanks.

### Expected behavior

#### Actual observed behavior

#### Debugging Data

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