Hi Gaurav,
You can refer to RFC3261 Call-ID ABNF syntax section:
[RFC3261 - page 228]
Call-ID = ( "Call-ID" / "i" ) HCOLON callid
callid = word [ "@" word ]
[RFC3261 - page221]
word = 1*(alphanum / "-" / "." / "!" / "%" / "*" /
"_" / "+" / "`" / "'" / "~" /
"(" / ")" / "<" / ">" /
":" / "\" / DQUOTE /
"/" / "[" / "]" / "?" /
"{" / "}" )
If you observe here ":" is allowed in call-id irrespective to position. So
in your case UAS behaviour is not correct to remove the ":". -pravin
On Thu, Aug 13, 2020 at 2:30 PM Gaurav Khare <gaurav.kh...@onmobile.com>
wrote:
> Hi,
>
> I have a specific problem relating to SIP header format.
>
> A UAC is sending Call-ID Header in INVITE as below
> Call-ID: :
> vat4082403130ofbcghefckco...@mscsma1.ims.mnc007.mcc748.3gppnetwork.org
>
> My UAS is sending 180 Ringing response as
> Call-ID:
> vat4082403130ofbcghefckco...@mscsma1.ims.mnc007.mcc748.3gppnetwork.org
> <mailto:
> vat4082403130ofbcghefckco...@mscsma1.ims.mnc007.mcc748.3gppnetwork.org>
>
> Notice the two colons in UAC request. In the response my stack is ignoring
> additional Colon(:) but the response is rejected by UAC. I am perplexed as
> to if colon(:) can be a part of Call-ID value or if two Colons(:) can occur
> sequentially delimiting Header name and value.
>
> If someone can point me to a Section of RFC, it will be very helpful.
>
> Thanks in advance,
> Gaurav Khare
>
>
>
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Pravin Kumar
+91-8919863869
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