SIP Port udp or tcp

[clifford.gormley]

Hello,

This should be easy to determine, but I seem to find conflicting info. on the Internet.

Does SIP use TCP 5060 or UDP 5060?

Thanks

[swdatapro]

UDP. 100%

[paolo bevilacqua]

Savoy Wilson wrote:
UDP. 100%

Not always. SIP can use both protocols. For example, Cisco mobile on iPhone, uses TCP exclusively.

[swdatapro]

OK. 99%

[paolo bevilacqua]

Sure. It only takes 1 bit wrong to make thing fail in networking.