Network Conferences with 3rd Party SIP Endpoint / Calling multiple Partys

[malte]

Hey,

so i am currently on deploying a Yealink CP935W Conference-Phone on our IP Office. (Just because Avaya B100 (KONFTEL) Devices are Shit and Overpriced)

When i started deploying, the IPO did great. I could ring up to 4 persons at the same time. For some reason i tried yesterday with another 3rd Party SIP. Since then, the IPO is giving 404 to every Participant, but the last one is ringing.

Bit schematic.. hopefully understandable - Every SIP 3rd Party behavior:

INVITE 374​

RINGING 374​

INVITE 375​

404 374 NOT FOUND​

RINGING 375​

INVITE 376​

404 375 NOT FOUND​

RINGING 376​

INTIVE 377​

404 376 NOT FOUND​

RINGING 376​

CONNECTED 376​

My next idea was using the System Conference. Wich URI is needed for 3rd Party SIP Devices? I tried ConfServer@ADDRESS (found that in my Workplace Client)... Did not Work. Google, as usual, wont help with that.

Some Details about our System:
1x IP Office Server Ed. Virtualized on VMware (EDTT: Version 11.1.2.3.0)
1x IP Office 500v2 Gateway (EDTT: Version 11.1.2.3.0)
WIFI Access Points to Connect the Yealink
DECT Basestations around the building.

Certifications: ACIS and ACSS
Location: Leipzig, Germany