16 feb 2010 kl. 10.40 skrev Alexandru Oniciuc: > Hello list, > > debugging SIP, I found many empty lines like: > > <--- SIP read from UDP://XXX.XXX.XXX.XXX:5060 ---> > <-------------> > > The IP address above corresponds to one of my accounts, which > is behind a firewall. > > Is that normal, maybe some firewall that tries to keep a port > open, or is my firewall cleaning the SIP Packet? > > Thanks in advance & best regards, > It's one way of sending a SIP keepalive, many phones do this to keep NAT open.
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