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General requirements:
- A trace always has to be reciorded recorded in the error state.
- The exact time has to be noted, when the error occured, so that the trace analysis can be focused on this time.
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- The involved telephone numbers have to noted, so that the trace analysis can be focused on these.
- When the following problems occur an additional Wireshark trace has to be recorded of the Internet connection as well as from the local network, where the SIP user is located. The procedure is described in this Knowledge Base article.
- One-sided voice transmission
- Missing voice transmission
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