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Author Topic: 1140E and I2004 Phones Refusing to work with SIP trunks via BSR222  (Read 1043 times)

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Offline rlsmeridian

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Hello all,

I currently am running a small BCM50 system with RLS 5.0 with 3 1140E phones, 2 I2004 phones and 2 digital T series sets.  I have 2 analog trunks, which seem pretty backwards to be using these on a system with IP telephones.  

I have set up SIP service with an external carrier called nexvortex.com and it works seamlessly wonderful with the digital sets.  Unfortunately, the IP phones are another story.  On my 1140E phones I cannot place any calls out, I receive a fast busy after 8 seconds.  The external SIP carrier is telling me that my BCM/BSR222 keeps sending a signal saying that it needs to "re-invite" the session and thus no calls can get through.  I can receive calls and CID, but when I answer the call, the line immediately hangs up and the external SIP carrier calls this a "Internal Server Error"   If I try to park a call from the digital phones and then retrieve on an IP phone, an error 500 occurs again from the SIP provider called another "Internal Server Error."  It seems as though something on my BSR222 is preventing me from making and receiving calls.  I have set up the port forwarding to allow port 5060 to 5080 be an exception to the firewall.

Secondly, when I try to place and receive calls to the I2004 phones, the somewhat same conditions occur but with a few variations.  I can pick up a parked call on the phone, but I hear no audio on the I2004 end, but I can hear audio, say on my cell phone when I try making the call.  So it's a one way conversation.  I talked to a friend at Nortel and he traced my route and said the problem is that the phone call is only getting to the BSR222 as far as 192.168.1.2, the BCM's address and not the 192.168.1.8, the IP I2004 phone itself!  So far, he said the best thing to do for now is use the digital phones and wait for BCM 6.0 to come out.  I am kind of hoping a patch comes out before then.  How do we push Nortel/Avaya for a patch?

Has anyone been successful of using the 1140E IP phones with external SIP carriers and a BCM50 RLS 5.0/BSR222, or am I a pioneer and first to do this?

What a frustrating experience this has been!  I've been trying since January and finally was able to get the Digital phones to work on it.  The digital phones are ok....but I want to use my expensive 1140E phones with all the bells and whistles!  I want to be able to park a call on one phone and not have it hang up on me when I go to pick it up on the IP phone.  To my knowledge most Nortel experts say I have been one of the first people to actually use an external SIP provider on the BCM.   I originally had a 3.0 system and just spent money out of my own pocket to upgrade to 5.0 to correct the IP problems....well apparently there seems to still be a lot of bugs here.  I am doing this for the love of telecom and as an interest of mine, more of a hobby.

Can anyone help?  Why is it so hard to use IP phones on VOIP SIP trunks??  It seems so backwards for me to be using the analog trunks for the IP phones and the SIP trunks for the digital phones.  

Thank you.

« Last Edit: May 10, 2010, 11:59:57 PM by rlsmeridian »


Offline Michael McNamara

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Re: 1140E and I2004 Phones Refusing to work with SIP trunks via BSR222
« Reply #1 on: May 11, 2010, 11:16:06 PM »
Very interesting problem...

If you haven't already please review this blog post which includes several technical configuration guides from Nortel regarding connecting the BCM50 to external SIP providers for PSTN access.

In reading your post it reminds me of how the CS1000 handles IP calls. If an IP phone calls a TDM/PSTN handset the RTP/SIP stream is between the IP phone and the VGMC (Voice Gateway Media Card). If an IP phone calls an IP phone the H.323 setup is through the Signaling Server but the SIP/RTP stream is direct between the IP address of each phone (you can see this in a packet trace).

I'm curious if the BCM is trying to instruct/handoff the call to the IP phone by having it connect with the SIP provider directly as opposed to the BCM being the intermediary. The IP phone either can't connect because it has no direct Internet connection, or if it does have an Internet connection then NAT breaks the SIP call setup.

Have you performed any packet traces of the IP phones behavior, I'm guessing they would probably tell you a great deal of what's going on.

The one-way-speech-path (OWSP) issue can sometimes result in a codec (G.729,G.711) mis-match between the IP phone, BCM50 and SIP provider.

I haven't read the technical configuration guides but I would be surprised if they don't mention something about this issue, if it's a well known issue. I'll have to ask a few of my Nortel/Avaya resources to see if I can confirm this problem.

Very interesting!
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