Chapter8. SIP Services
Accept TCP Marked As TLS
Whena TLS accelerator is used, SIP packets can be sent to the Telecommuting Module via TCP, but the packet
contentwill look as if TLS was used.
Selectif TCP packets with TLS content should be accepted. The recommended setting is not to accept them.
Allow Large UDP Packets
Sometimes,the SIP signaling UDP packets get larger than the standard allows. There are two ways to handle this;
eithersend large UDP packets, which may become fragmented into several packets, or use TCP. Some SIP devices
maynot be able to receive TCP packets, which means that you have to allow large UDP packets, but to do this
violatessection 18.1.1 in RFC 3261.
Thissetting only affects SIP signaling packets.
Selectif large UDP packets should be allowed. The recommended setting is not to allow them.
Remove Headers in 180 Responses
SomeSIP servers require that the Contact and Record-Route headers are removed from 180 responses.
Selectif the Telecommuting Module should remove these headers in 180 responses. The recommended setting is to
keepthe headers.
Open port 6891 for file transfer
Messengerclients do not always use the ports that are negotiated in the SIP signaling. In particular, the File Transfer
functionalways uses the same port, regardless of what is negotiated. To make File Transfer work through the
TelecommutingModule you must open port 6891, the Messenger File Transfer port.
Youonly need to do this if File Transfers are made between clients on different networks; if transfers are always
onlymade between clients on the same network, no extra ports need to be opened.
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