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SIP TCP or UDP

Nguyen KeThuc
Beginner
Beginner

Hi all,

In Cisco Phone Security Profile, We have two options TCP and UDP transportation Type. So, Any body know what are the different between TCP vs UDP SIP?  what are the limitation and advantage of each one?

Thanks

Thuc

4 Replies 4

Dennis Mink
VIP Alumni
VIP Alumni

one is connection oriented (TCP) on isnt (UDP). the SIP signalling inside is identical.

SIP itself is connection oriented by itself, so theoretically it doesnt matter if you use TCP or UDP

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Hi Dennis,

I mean that what are the difference between their phone features?

There are no differences in phone features. Same features, just transported with a different Layer 4 protocol.

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Ayodeji Okanlawon
VIP Alumni
VIP Alumni

Nguyen, TCP or IDP are transport protocols for sip messaging. It doesn't impact phone features. Generally sip over udp is preferable, because it's such a light protocol however if you are in an environment where your sip messages will be larger over the traditional 1500 bytes of traffic then it is better to use tcp to a avoid fragmentation of sip packets by udp

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