This guide explains how to set up the Aastra 6730i series and Aastra 6750i series SIP Telephones.
For more information on the Aastra/Mitel range of SIP Telephones, please visit the Mitel product website.
Please note that Aastra is now owned by Mitel.
If registration is failing, check over the settings entered above.
Ensure SIP ALG is disabled on your router. See this page for further information.
If the Status page shows timeout, check over your firewall settings.
Try using TCP instead of UDP for SIP Transport. This may help in situations where SIP ALG on a router is causing issues and there is no way to disable it.
If calls are cutting out, or the phone loses registration, enable or increase the frequency of SIP keep-alive settings. Set Line 1 → Registration Period (under Basic SIP Network Settings) to a lower figure.
If you are still having trouble registering, contact SureVoIP Technical Support.