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Call forwarding MyPBX Standard v7

Liviu Marian Iordache

February 17, 2020 09:18

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Hello everyone,

I'm new here and I have some questions about a very old PBX (MyPBX Standard v7) if anybody can help me.

The questions are related to call forwarding and the caller ID.

So... I have this PBX which I managed to setup and works perfectly over a SIP trunk. I also have an Yealink T28 and I want to forward calls from that phone to an external call number and I want to forward also the initial caller ID (my phone company - Vodafone Romania - allows this feature) (A calls B, B forwards to C). So I get the calls forwarded but the number displayed to C is the main number of my SIP trunk.

I contacted my phone company and they told me that there is a problem with the diversion header. The initial firmware of MyPBX didn't have an option to control diversion header but after long google searches I found a beta firmware that has this option so I checked in PBX advanced settings diversion header. Even after this firmware upgrade I could not get the initial caller ID forwarded.

I thought it's something from my phone company but today, playing around with my pbx settings i set up, for the extension where i have that Yealink T28, follow me always option to a phone number and made a test call. Big surprise, on the display of the phone set up as follow me i got the original caller ID.

 

So I guess there is nothing wrong with my phone company but I think there is something related to the connection from MyPBX and that T28 phone. I tried all the possible options for caller ID source in T28 advanced SIP settings but nothing seems to work.

 

My question is: Does anybody have any idea how to set this the proper way? Like I said, I can do it now from MyPBX extension setting but it would be great the get this working as real call forward not as follow me (in other words I don't want to allow access to MyPBX for the users to set up follow me to the numbers they want but I want them to setup call forwarding in their phones.

 

Thank you!!!

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4 comments

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  Larry Neblett February 17, 2020 11:11

  CallerID (CID) is one of the more perplexing and misunderstood items. The PBX controls CID on outbound calls as the T28 only knows its internal username (extension number) and has no idea of the company number.

  Additionally, the "initial" or originator CID is the CID of the person who originally called in and was forwarded. Most want to see this number so that in the event of a disconnect, they can use the originator ID to effect a call back; otherwise you only see the company number and have no way to call back unless you happen to know or remember.

  The first question is in what field (SIP header) does your provider expect to see the CID? The most common fields are the From, PAI and RPID.

  The second question is if Diversion headers are honored by the provider or if they will want to see a separate INVITE? There are many providers that will not honor diversion headers as may consider them a security issue. I seldom use diversion headers, which should force the PBX to treat the forward as a new call and thus cause a new INVITE. 

  The third question is whether you are truly using forwarding from the phone or via the UCM? Phones can be connected to remote PBX systems, providers, or local PBX systems such as MyPBX. However, when connected to a provider, the provider may not offer calling services such as forwarding; yet the phone may be enabled for local services and as such the forwarding is actually handled by the phone. On the other hand, the local services may be disabled in the phone and the PBX may handle the forwarding. They need not log into the PBX to implement call forwarding. There merely need to dial the appropriate feature code followed by the number they wish to forward to. It is similar to how the phone does it, but the difference is that if the PBX knows about the forwarding, it will handle the forwarding without having to send to the phone at all. If the phone is handling, then the call must be sent to the phone first and then the phone will handle. You can read more about the feature codes in the MyPBX manual (link following):

  https://www.yeastar.com/download/MyPBX_SOHO_UserManual_en.pdf

  The fourth question is what type of SIP trunk are you using, peer or register?

  While looking at the manual look for the DOD section,. This is where many are able to specify what they want to use for an outgoing CID. IT may or may not work as it depends on the provider and possibly whatever settings you may have tried in the meantime, but you may get lucky so, it's worth a try. 

  If not successful, then let us know along with what you did as well as the answers to the above questions.

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  Liviu Marian Iordache February 17, 2020 15:31

  Thank you for your quick reply.

  I don't have right now the answers for all the questions but for those I have here they are.

  Q 3 answer: To be clear. That phone is not connected directly to the sip provider but to my PBX. The cable from the sip provider is connected to the WAN port of MyPBX and the phone is connected to the lan port of MyPBX through a switch. And like I said everything works as expected except for this call forwarding. When I forward the calls from the phone I don't get the originator caller ID, but, instead, the main phone number from my sip account. When I "forward" the calls from MyPBX it's working (not quite a true forwarding - I set up follow me to a phone number for the extension - so when somebody calls it gets a message from the pbx and then it's transfered to the phone numer set up in follow me, this last one sees the original caller ID). Regarding extra codes for call forward I didn't set up any and I don't need them (call forward can be activated on the T28 phone either through the phone menu, either in a browser pointing to the IP of that phone) and 

  Q 4 answer: It's a register sip account. Regarding DOD I already set up this feature as I needed and works as expected (I can set up there any caller ID an it's working). The only thing which might be a little strange is that the number format in DOD has to be without a 0 in front of the number (In Romania numbers begin with 0 but in DOD I have to write the number without that 0). Before testing the Follow me function I thought this was the problem. The originator caller ID comes with a 0 in front, the PBX passes this ID to the phone and the phone redirects the call with the originator caller ID, through the PBX. This originator ID is with a 0 in front (like i said, all the numbers here in Romania begin with a 0) and knowing that in DOD it must be without that 0, I thought this was the problem. But after discovering that follow me redirects the original caller ID, it became obviously the problem is not in that front 0. 

  Checking call logs in MyPBX I see no difference if that forward is set up from phone or from PBX. Either way, the PBX tries to go outside with the original caller ID. Which makes things even more strange.

   

   

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  Liviu Marian Iordache February 17, 2020 15:50

  I did a packet capture in both situations and I think I found the problem. If the forwarding is setup in phone the sip header contains RPID. If the forwarding is set up in PBX the header has P-Asserted-Identity. So I think that my provider supports PAI and not RPID (or maybe both but for RPID the number has to be without that front 0 and PAI can be with that front 0) and I have to find a way for that T28 phone to forward the calls with PAI and not RPID in header 

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  Larry Neblett February 17, 2020 18:23

  Why are you wanting the T28 to forward instead of the PBX? 

  The PBX is the only device communicating with the provider. The PBX takes the extension identity from either the DOD settings or the CID settings in the extension settings of the PBX when making an outward call. The phone will not pass PAI as the phone doesn't know anything about the outward DID/CID. It only knows its extension as XXX and if a call comes in and is routed elsewhere the originating number will be in the RPID. The phone may also pass-through a PAI header, but it will not pass the outbound caller ID of the company in any field, only the PBX can do that. 

  So, yes, if you are forwarding at the phone, you will get the originating CID.

  I guess I should also point out that the MyPBX series is EOL and does not have quite the same CID manipulation as newer S models.