It must be greater that or equal to 3.

Dushyant P S Dhalia


OKUMURA Shinji wrote:
Hi,

I have a question regarding CSeq of retried INVITE.

Consider the following scenario.

	|      INVITE(CSeq:1)        |
	|--------------------------->|
	|                            |
	|      18x                   |
	|<---------------------------|
	|                            |
	|      PRACK(CSeq:2)         |
	|--------------------------->|
	|                            |
	|      200 OK(PRACK)         |
	|<---------------------------|
	|                            |
	|      415                   |
	|<---------------------------|
	|                            |
	|      ACK                   |
	|--------------------------->|
	|                            |
	|      INVITE(CSeq:2)        |
	|--------------------------->|
	|      with the same Call-ID |
	|                            |


according to the section 8.1.3.5 in RFC3261, 2nd INVITE
  "SHOULD have the same value of the
   Call-ID, To, and From of the previous request, but the CSeq should
   contain a new sequence number that is one higher than the previous."

therefore, I think the CSeq of 2nd INVITE SHOULD be "2".

Is my understanding correct?

Regards,
Shinji
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