Yes you are correct.
Refer to RFC 3261 section 16.3
1. Reasonable syntax check
This protocol is designed to be extended. Future extensions may
define new methods and header fields at any time. An element MUST
NOT refuse to proxy a request because it contains a method or
head
> From: Vineet Menon [mvineetme...@gmail.com]
>
> I was wondering what is the significance of ACK in SIP?
The specification of its use is in RFC 3261, of course.
The reason that INVITE uses ACK but other methods do not is that final
responses (200) to INVITE are not returned immediately, but may
3-way handshake needed because 1xx responses stop retries of INVITE. However,
the ACK can also contain things such as an answer SDP.
> -Original Message-
> From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> implementors-boun...@lists.cs.columbia.edu] On Behalf Of Vineet
Please read RFC 3261. You should read section 4 Overview of Operation and
other places where ACK usage is discussed.
For example, Offer/Answer exchanges can happen in 200 OK and ACK.
Thanks,
Neel.
> -Original Message-
> From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
See RFC 3261, RFC 3264, and RFC 6337 concerning offer/answer model and failure
responses such as 488.
> -Original Message-
> From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> implementors-boun...@lists.cs.columbia.edu] On Behalf Of Vineet Menon
> Sent: Monday, February 0
Hi,
I was wondering what is the significance of ACK in SIP?
I mean can't the caller UA just send the media instead of the ACK message?
This feature is present in H.323 too, so it might have some significance!
Its just that im not able to get it
Regards,
Vineet Menon
___
Hi,
Can somebody tell me what is the scope of capability negotiation in SIP?
Take this scenario,
A Invite with H.264
codec--- > B
A <--200 OK with H.261
codec- A
What will be the codec use
Hi Mahudeswaran,
Doesn't SIP recommends all proxies to make the custom headers pass i.e
headers which proxies cannot understand!! I have read it a couple of
reputed papers where the authors have implemented their custom enhancement
to SIP using custom headers.
Regards,
Vineet Menon
On 6 Febr
See RFC 5727; it obsoletes or updates some of the related prior RFCs.
> -Original Message-
> From: sip-implementors-boun...@lists.cs.columbia.edu [mailto:sip-
> implementors-boun...@lists.cs.columbia.edu] On Behalf Of Vineet Menon
> Sent: Monday, February 06, 2012 2:42 AM
> To: Sip-impleme
Hi,
>>Can I add any custom headers to extend SIP, if it doesn't interfere with the
>>existing protocol?
Some time back we heard & we do exchange custom information from end to other
with the help of custom sip headers.
e.g. 'x-header1:value1'. the header that starts with 'x-' treated as custom s
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