PURE M3700 Manuel d'utilisateur télécharger pdf (Page 49)

M3700 user manual

8.7 Target the Media (RTP)

For the SIP call passing through NAT, it is possible that the media would not deliver properly; owing

to the RTP contact information (IP address, port number) is different from original RTP packet. This

function selects different contact information for M3700 to send RTP Packets to other SIP device

within far-end NAT. It designates whether to use the source contact information from the UDP/IP

header (Symmetric RTP) or the contact information specified within the packet (SDP) when the unit

send RTP packet

Web Folder：ADVANCED\SIP COMMON, Default Value is SDP

Example 1: Via Symmetric RTP

The source contact information (IP, port number) of RTP packet is IP: 61.222.217.30, port number:

10000, but the SDP in the packet is IP: 10.13.6.18, port: 4000. In this case, please Use

Symmetric RTP

61.222.217.30

port: 10000

Network

SDP in Packet

10.13.6.18

port: 4000

M3700

(192.72.83.23,

port: 10000)

M3700 tries the contact information from SDP first (IP:10.13.6.18, port number: 4000). If M3700

finds that the contact information from SDP is different from the source contact information, then it

will try the source contact information, as the example above, use IP:61.222.217.30, port

number:10000. It makes SIP call successful.

Example 2: Via SDP (Default)

This selection ignores the source contact information (IP, port number) which M3700 received. It

always sends the RTP packet to the contact information (IP, port number) described in the packet

(SDP) received.

SDP in Packet

10.13.6.18

port: 4000

Network

M3700

(192.72.83.23,

port: 10000)

Send RTP to

10.13.6.18

port: 4000

DCC NO. 91710015011

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PURE M3700 Manuel d'utilisateur Page 49