[SIPForum-discussion] Difference Re invite & Re attampt in SIP

[Dasu B]

Hi,

I agreed with both for re-attempts scenario..Ideally whenever far end
gateway will not be reacheable or does not getting any response then same
Invite will send multipul times(depend upon switch) thats called
re-attempts.

Thanks
B Dasu



On Tue, Jun 15, 2010 at 5:28 PM, Nitin Kapoor <nitinkapoorr at gmail.com>wrote:

> Rajesh,
>
>
>
> Essentially both are the different things, and also using with different
> mechanism.
>
>
>
> Ideally whatever the modification is involve changing addresses or ports,
> adding a media stream, deleting a media stream, and so on. This is
> accomplished by sending a new INVITE request within the same dialog that
> established the session. An INVITE request sent within an existing dialog is
> known as a re-INVITE.
>
> Note:  that a single re-INVITE can modify the dialog and the parameters of
> the session at the same time.
>
>
>
>
>
> Now If we say about the re-attempt, which may be used by for totally
> different purpose. Like in REGISTER method.
>
>
>
> For ex:  If because of any reason transaction layer return a timeout
> error(408), because your register did not get any response, at that time
> your UAC should **RE-ATTEMPT** to register the device again but it should
> not be immediately(beucase the immediate **re-attempt** is likely to also
> timeout).
>
>
>
> Also here is the another use of **re-attempt** of in IMG
>
>
>
> When a call is attempted to an “unreachable” gateway, the IMG will
> automatically trigger the **re-attempt** logic if the gateway is part of a
> route list.
>
>
>
> Now I might be wrong too in  **re-attempt** scenario. Please wait for the
> others opinion as well.
>
>
>
> Thanks,
>
> Nitin Kapoor
>
>
>   On 15 June 2010 00:51, Rajesh Paswan <rajesh.paswan at gmail.com> wrote:
>
>>   Hi All,
>>
>>
>> Could you please clear me differece between Re invite & Re attampt in SIP,
>> with SIP responce code.
>>
>>
>> --
>> Thanks
>> Rajesh Paswan
>>
>>
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