This issue is still present in Ekiga in Gutsy (all updates applied). After doing a hibernate, Ekiga tries to reregister on the resume and fails (in my case it says the failure is due to a timeout). There is no easy way of getting Ekiga to re-register (it would be nice if it tried a few times after a failure) other than disabling and re-enabling all the accounts or restarting Ekiga.
This issue is still present in Ekiga in Gutsy (all updates applied). After doing a hibernate, Ekiga tries to reregister on the resume and fails (in my case it says the failure is due to a timeout). There is no easy way of getting Ekiga to re-register (it would be nice if it tried a few times after a failure) other than disabling and re-enabling all the accounts or restarting Ekiga.