Subject: [Sipping] Is CONTACT header mandatory in all INVITES

From: Doug Hurtig <[email-masked]>
Date: Mon, 28 Jan 2002 17:47:38 -0600

Hi,

Would like to verify that a Contact header must be present
in all invites,

including mid-call invites.

If not true, when is a Contact headr optional in an INVITE
message?

If this is true should the saved RouteSet be updated each
time a new INVITE

is received?

Did see in section 12.2.1.1 the following: "However, requests
that are

not refresh requests do not affect the route set for the
dialog".

What is a refresh request?

--

Regards,

Doug Hurtig

Tekelec

2425 N. Central Expressway

Richardson, Texas 75080

[email-masked]

972.301.1203

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