[cisco-voip] Compatibility issues with the HUAWEI ISDN Switches

[keli at carocomp.ro]

I can confirm, that we had some unexpected problems when facing a  
Huawei SoftX3000 switch, also through E1 PRI.

Although none of these issues appeared while connecting to other  
telephony providers, I can't be 100% sure that the problems were due  
to the Huawei softswitch, as I have no hard evidence:

- fax is basically non-working. After a month of debugging the  
provider admitted, that the fax isn't really working in their network.  
(Not as surprising if one considers, that the traffic from the  
softswitch is forwarded on IP)

- we had very intermittent transfer problems, where the call would  
disconnect while being transferred. The provider blamed our config,  
telling that we shouldn't send ISUP signalling on the ISDN, while  
transferring. It never happened with other providers.

I will definitely check for the callerID issue and get back to you if  
it's repeated. Otherwise it could just be a configuration problem on  
the Huawei.

regards,
   Zoltan

Quoting wael ahmed el mezain <wael733 at hotmail.com>:

>
> Hello All,
>
> Is there any one faced any problems during connecting Cisco E1s   
> (PRIs) to serivce provider (PSTN) using HUAWEI CO.
>
> We did not get any problem if the same service provider connect the   
> our clients PRIs through Siemens or Ericson.
>
> But we have a lot of issues if the SP connect our clients through   
> the Huawei ISDN switches (Like, called side still hear a ringing   
> even after the receiving side refuse the call, client can change the  
>  calling number without restriction like I can change my number to   
> 911 (Emerg number) and it will be displayed  as 911 at called party,  
>  Call disconnecting, one-way audio and low volume when calling)
>
> We got the below reply from Cisco
> ==============================
> For PSTN (CO) connections, we do not specify particular COs, we   
> specify only standards and we pretty much connect to all COs used in  
>  the world. Thus either the PRI or the FXO standards in the area   
> should work, and if both the router and the CO comply with these   
> standards, and I'm fairly sure they do, then we can connect.
>
> As for the PBX connectivity we specify only standards and we do not   
> "certify" particular PBXs. However, there is more variance in the   
> standards compliance of PBXs that there is in the PSTN, so we do   
> interoperability testing with high-runner PBXs and publish   
> configuration app notes. These are not certifications, they are just  
>  configuration examples.
>
> These app notes you can find at   
> http://www.cisco.com/en/US/netsol/ns728/networking_solutions_program_category_home.html .  We have conducted testing with Siemens, Alcatel, Nortel, Avaya, and Ericson PBXs, but not with Huawei.  If Huewei PBXs comply with the same standards, then there should be no   
> issue.
> ================================
>
> Any comment from any one
>
> Thanks,
> Wael Ahmed
>
>
>
>
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