[Asterisk-Users] Spring VON Wrap Up

[Olle E. Johansson]

Scott Laird wrote:
> 
> On Apr 5, 2004, at 12:10 PM, Olle E. Johansson wrote:
> 
>> Members of the IETF added information on the to-be-standardized standard,
>> meaning that SIP with TLS over TCP will be mandatory. We need to start 
>> working
>> on TCP and TLS support.
> 
> 
> Could someone explain to me why anyone in their right mind would ever 
> want to run VoIP (or any lossy real-time data) over TCP?  Unless I'm 
> missing something, the effects of packet loss would be almost perfectly 
> pessimal.  Every time you lose a packet, the receiver stalls and then 
> can't catch up, so you get horrifically huge delays.  Does it actually 
> gain something for anyone doing voice or video?
SIP over TCP means signalling over TCP. Media is still usually RTP/UDP.
SIP over TCP and TLS authenticates both ends and may also protect the
signalling with encryption.

SRTP protects RTP/UDP media with encryption.

There are concerns that sending positioning within SIP/UDP will reveal
private detailes, like position. Hence the encryption requirement.

The position data needs to be given by the ISP in DHCP configuration.

/O