[SIPForum-discussion] Blank call flow in SIP

Thu Feb 20 05:15:03 UTC 2014

Hi All,

Thanks for all.

Pls find below  SDP and ISUP message from sender.

No IPs found like 0.0.0.0 and "sendrecv " available in SDP.

But in ISUP message Echo control indicator not included.

-unique-boundary-1
Content-Type: application/sdp

v=0
o=- 16464421 16464421 IN IP4 10.129.247.251
s=-
t=0 0
a=sendrecv
m=audio 34362 RTP/AVP 96 8 97 98 99
c=IN IP4 10.129.34.11
a=rtpmap:96 AMR/8000
a=fmtp:96 mode-set=0,2,4,7;mode-change-period=2;mode-change-neighbor=1
a=rtpmap:8 PCMA/8000
a=rtpmap:97 AMR/8000
a=fmtp:97 mode-set=7
a=rtpmap:98 GSM-EFR/8000
a=rtpmap:99 telephone-event/8000
a=fmtp:99 0-15
a=maxptime:40

--unique-boundary-1
Content-Type: application/isup;version=itu-t92+;base=itu-t92+
Content-Disposition: signal;handling=required

IAM----Initial address message

Mandatory parameter:
Nature of connection

indicators:
Satellite indicator:1 satellite circuits in the connection
Continuity check indicator:Continuity check not required
Echo control device

indicator:Not Include

Forward call indicators:
International/national call

indicator:national call
End-to-end method indicator: Not available
Interworking

indicator: Interworking not encountered
End-to-end information indicator: Not

available
ISDN user part indicator: ISDN user part used all the way
ISDN user

part preference indicator: ISDN user part preferred all the way
ISDN access

indicator: Originating access
SCCP method indication: No indication
Collect

Call:0

Calling party category:Ordinary subscriber
Transmission medium

requirement:Speech

Called party number:
Nature of address: National

(significant) number
Internal network number indicator (INN):   *routing to

internal network number not allowed
Numbering plan indicator: ISDN numbering

plan
Address signal: 04428251552F

Optional parameter:
Calling party number:
Nature of address: National (significant) number
Calling party number

incomplete indicator (NI):   *Complete
Numbering plan indicator: ISDN numbering

plan
Address presentation restricted indicator: Presentation allowed
Screening

indicators: Network provided
Address signal: 9412000135
Optional forward call

indicator:
(CUG)call indicator:Closed user group call, outgoing access

allowed
Simple segmentation indicator:No additional information will be sent
Connected line identify request indicator:Request
Closed user group interlock

code:
Network identification (NI): 9_4_1_2
CUG Group NO: 3
User service

information:
Coding standard:CCITT standard coding
Information transfer

capability:Speech
Transfer mode:Circuit mode
Information transmission rate

(terminating point->originating point):64 kbit/s
User information Layer 1

protocol:Recommendation G.711 A-law
Propagation delay counter:  90 ms
MLPP

precedence:
LFB:LFB not allowed
Precedence level: Routine
Network

identification (NI): 0_9_1_0
MLPP service domain 00_00_00
Location number:
Nature of address: International number
Internal network number indicator

(INN):
  *routing to internal network number not allowed
Numbering plan

indicator: ISDN numbering plan
Address presentation restricted indicator:

Presentation allowed
Screening indicators: Network provided
Address signal:

919457099995
Parameter compatibility Information:
Parameter#1
Propagation

delay counter:
Transit at intermediate exchange indicator:  Transit

interpretation
Release call indicator:  Not release call
Send notification:

Not Send notification
Discard message indicator:  Not Discard message
Discard

parameter indicator:discard parameter
Pass on not possible indicator:discard

parameter

*----------end isup message data----------*/

With Regards

M. Ramachandramoorthy
NGN-BSNL
+91- 9600070877

On Thu, Feb 20, 2014 at 12:56 AM, prashant tripathi
<prashant.tpt at gmail.com>wrote:

> dear,
>
> can you please confirm if media attribute in SDP is "sendrecv" also if
> there is any value in media ip or it's marked as 0.0.0.0?
>
> On Tue, Feb 18, 2014 at 3:03 PM, Ramachandra moorthy
> <ramcm.irtt at gmail.com> wrote:
> > Hi All,
> >
> > I am doing testing with mobile to PSTN calls via SIP.
> > Found all calls are mute calls.
> > I have tested with mobile to mobile,few calls are ok remaining all are
> mute.
> > Also compared normal call and problematic call traces,all are seems same
> > only.
> >
> > All media IPs are re3achable from both the ends.
> >
> > Kindly suggest me to analyse further to find the root cause.
> >
> > Also pls clarify is  there any signaling flow in SIP for blank calls.
> >
> > pls help
> >
> > With Regards
> >
> > M. Ramachandramoorthy
> > +91- 9600070877
> >
> > _______________________________________________
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