PLANET VIP-350PT User Manual
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c=IN IP4 192.168.3.101
m=audio 35000 RTP/AVP 18
a=rtpmap:101 telephone-event/8000
a=direction:
passive
IN IP4
To make symmetric RTP flow works, the UAS (which sends passive RTP flow) must locate on the
WAN. For IP Phone, it must comply with one of the following conditions:
• It resides on the public Internet and has public IP (Full-Access).
• It has configured to employ “2.Static NAT map” as its way to traverse its NAT from 『Main
Menu』=>”6.Network” / ”NAT & firewall” / ”UDP traversal”, and you have configured your
NAT to statically map the corresponding UDP ports (both SIP signaling and RTP ports) to your
phone.
• It is behind a NAT which can be traverse by STUN and you have configured your IP Phone to
employ STUN to traverse you NAT.
• It is behind a UPnP-capable NAT and you have configured your terminal to employ UPnP to
dynamically MAP your UPnP-aware NAT.
[On] / [Off]: Toggle between enable and disable this feature. Show check symbol ‘√’ in-line if enabled!
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Network & Firewall
To properly configure your NAT traversal scheme, refer to “NAT Traversal” on “User’s Manual”.
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Note
For backward compatibility with other SIP phones, system default is to disable
“Symmetric RTP flow”, thus the “a=direction” attribute will not appear in the
exchanged SDP.