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Analog phone couldn't display the calling number

Publication Date:  2018-02-28 Views:  69 Downloads:  0
Issue Description

Vesion info: U1911---V200R003C30SPC500B0115; IAD: V300ROO2C01SPCc00

Toplogy: SIP trunkàU1911às2700àIADàPhone Set

Backgroud: Customer add prefix 8 in U1911 for local phones and local call can be established successfully but couldn't display the calling number.

Handling Process

1. Check POST user configuration to make sure the caller and callee is corret:

we have two functions called CLIP(calling line identification presentation) Service and CLIR Service(calling line identification restriction) can be configured in U1900.

When U1911 is set as default and 801 call 802, called number 802 should have CLIP function to display number unless:

1)         802 disabled CLIP function

2)         801 enabled CLIR function

Correct setting example for both 801 and 802:



2. Use Openeye to simulate SIP user and make call betwwen analog, we found Openeye cna display numbers that means the problem should come from IAD

3. Use below ways to check the mode of calling display signalling. Howerver, it's hard to specify it's FSK or DTMF because number showing between first and second ring:

Use analog phone call and if the number dispalyed imdiately when phone ring the first time, it should be DTMF. Otherwise, need capture the siganling trace to check.

4.Check cid-mode setting in IAD:

a) login IAD with root account and enter config mode: configure terminal

b) check setting: display sip soft-parameter

It's fsk.


5. Enter advanced mode and modify cid-mode to dtmf and test. The problem still exist:

sip soft-parameter sid-mode dtmf


6. Change FXO time with below commands, but analogy display error: out of area, so the probkem should be related to message trans format.

sip soft-parameter sid-mode fsk

sip soft-parameter first-ring-to-FSK-time 600


7. Change the trans format to sdmf and then the issue is solved:

dsp fsk trans-format sdmf


Root Cause

IAD dsp message trans format is wrong setted, should be sdmf

Solution

login IAD advanced mode, and change the trans format to sdmf and then the issue is solved:

dsp fsk trans-format sdmf

END