[SIPForum-discussion] Blank Calls in SIP Trunking in ZTE ZXC10 & Huawei MSOFTX3000 Soft Switches

[Simha jkc]

SARKER ROHAN,

The Issue of Blank Calls in SIP Trunking could be due to many reasons.
few of them (that i could guess with out knowing network topology) are
given below :

1. SIP traffic generated by bad clients (where the clients are not
implemented properly
    i.e., venerability within the software itself )
2. An network attacker/Hacker trying to perform Denial of Service on
your networks.
3. Bad VoIP network designs.
4. Bad configuration performed for VoIP/Data networks equipments.
5. A bad router with bad QOS implementation can also lead to dropping of calls.

Some of the possible solutions:
1. Double check the network design.
2. Configure the Access Service list for VoIP network equipment.
3. Try to avid mixing/Data(HTTP) and VoIP traffic.


Hope this was helpful.

Cheers
Simha








On Sun, Jan 10, 2010 at 12:03 AM, SARKER, ROHAN (ROHAN)
<rohan.sarker at alcatel-lucent.com> wrote:
> Dear all,
>
>
>
> I am working in switching domain in Alcatel-Lucent India and is facing the
> problem of Blank Calls for SIP Trunking in ZTE ZXC10 & Huawei MSOFTX3000
> Soft Switches.
>
>
>
> Experts here are saying that this is due to bandwidth getting exceeded in
> RDN [Data Network].
>
>
>
> I cannot agree with it totally.
>
>
>
> I need a reasonable reason of Blank Calls as this is increasing in terms of
> customer complains for our Telecom Circle.
>
>
>
> For TDM Trunking, Blank Call cases are nearly zero.
>
>
>
> Can I have a satisfactory answer to my question with Sequence or Activity
> Diagrams if possible.
>
>
>
> Thank you.
>
>
>
>
>
>
>
>
>
> Thanks and regards
>
> Rohan Sarker
>
> Deputy Manager
>
> Alcatel-Lucent
>
> DAKC, Navi Mumbai
>
> M:+919320496780
>
> R:+919903051236
>
> O:+912230372803
>
>
>
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