RFC 4028 mandates that the Session-Expires header contains a refresher= parameter.
The current implementation fails against some SBCs.
Here is a small patch that solves this.
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Thanks.
It would be easier if you can make a pull request via github -- there are some automatic tests running for each pull request, being also easier to apply the patch.
Just be sure you format the commit message as per guidelines at:
* http://www.kamailio.org/wiki/devel/git-commit-guidelines#commit_message
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Closed #288.
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Fixed by @linuxmaniac with commit 5b97d81
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