On Friday 24 February 2006 13:08, Or wrote:
> Hello,
>
> I do it: tcpdump -i visdn0 -w outgoingcall
> Could you decode it for me please?
Here it is:
Q.931
Protocol discriminator: Q.931
Call reference value length: 1
Call reference flag: Message sent from originating side
Call reference value: 0B
Message type: SETUP (0x05)
Bearer capability
Information element: Bearer capability
Length: 3
...0 0000 = Information transfer capability: Speech (0x00)
.00. .... = Coding standard: ITU-T standardized coding (0x00)
1... .... = Extension indicator: last octet
...1 0000 = Information transfer rate: 64 kbit/s (0x10)
.00. .... = Transfer mode: Circuit mode (0x00)
1... .... = Extension indicator: last octet
...0 0011 = User information layer 1 protocol: Recommendation G.711
A-law (0x03)
1... .... = Extension indicator: last octet
Calling party number: '400'
Information element: Calling party number
Length: 5
.... 0000 = Numbering plan: Unknown (0x00)
.000 .... = Number type: Unknown (0x00)
0... .... = Extension indicator: information continues through the
next octet
.... ..01 = Screening indicator: User-provided, verified and passed
(0x01)
.00. .... = Presentation indicator: Presentation allowed (0x00)
1... .... = Extension indicator: last octet
Calling party number digits: 400
Called party number: '0661727658,30,rT'
Information element: Called party number
Length: 17
.... 0000 = Numbering plan: Unknown (0x00)
.000 .... = Number type: Unknown (0x00)
1... .... = Extension indicator: last octet
Called party number digits: 0661727658,30,rT
High-layer compatibility
Information element: High-layer compatibility
Length: 2
.00. .... = Coding standard: ITU-T standardized coding (0x00)
High layer characteristics identification: Telephony
Don't you see something interesting in "Called party number" ?
And here is the explanation :)
Q.931
Protocol discriminator: Q.931
Call reference value length: 1
Call reference flag: Message sent to originating side
Call reference value: 0B
Message type: RELEASE COMPLETE (0x5a)
Cause
Information element: Cause
Length: 2
.... 0111 = Cause location: International network (INTL) (7)
.00. .... = Coding standard: ITU-T standardized coding (0x00)
1... .... = Extension indicator: last octet
.110 0100 = Cause value: Invalid information element contents (100)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
1... .... = Extension indicator: last octet
Bye,
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