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![UCM rejects Inbound Calls with 404 Not Found due to DNS](https://static.wixstatic.com/media/39e94b_16c2963ec4a0491db13a0ca3208e8e54~mv2.png/v1/fill/w_454,h_341,fp_0.50_0.50,q_95,enc_auto/39e94b_16c2963ec4a0491db13a0ca3208e8e54~mv2.webp)
![Postman HTTPS API - Return status -8](https://static.wixstatic.com/media/39e94b_eed5828d7188441196b6eaa17e4d0f7c~mv2.png/v1/fill/w_454,h_341,fp_0.50_0.50,q_95,enc_auto/39e94b_eed5828d7188441196b6eaa17e4d0f7c~mv2.webp)
Postman HTTPS API - Return status -8
![](https://static.wixstatic.com/media/11062b_2389ef8c03db4dd9a65593bbb43630e6~mv2.jpeg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/11062b_2389ef8c03db4dd9a65593bbb43630e6~mv2.webp)
![No Audio during Call Forwarding to External Number](https://static.wixstatic.com/media/11062b_2389ef8c03db4dd9a65593bbb43630e6~mv2.jpeg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/11062b_2389ef8c03db4dd9a65593bbb43630e6~mv2.webp)
No Audio during Call Forwarding to External Number
![](https://static.wixstatic.com/media/b34a4afd9ffc46c7870c23e33c729184.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/b34a4afd9ffc46c7870c23e33c729184.webp)
![Sample Test Plans / Test Cases](https://static.wixstatic.com/media/b34a4afd9ffc46c7870c23e33c729184.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/b34a4afd9ffc46c7870c23e33c729184.webp)
Sample Test Plans / Test Cases
![](https://static.wixstatic.com/media/39e94b_c7a62a0f8b6b4f53958dc4a11413d05e~mv2.jpeg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/39e94b_c7a62a0f8b6b4f53958dc4a11413d05e~mv2.webp)
![Phones stuck at 'Recovery Incomplete'](https://static.wixstatic.com/media/39e94b_c7a62a0f8b6b4f53958dc4a11413d05e~mv2.jpeg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/39e94b_c7a62a0f8b6b4f53958dc4a11413d05e~mv2.webp)
Phones stuck at 'Recovery Incomplete'
![](https://static.wixstatic.com/media/d1c33c1a23dd44d7a523132e835133cb.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/d1c33c1a23dd44d7a523132e835133cb.webp)
![Call Forwarding Setup in ATA HT8XX](https://static.wixstatic.com/media/d1c33c1a23dd44d7a523132e835133cb.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/d1c33c1a23dd44d7a523132e835133cb.webp)
Call Forwarding Setup in ATA HT8XX
![](https://static.wixstatic.com/media/nsplsh_181a9d25769348a491c8e35f869b5b5f~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/nsplsh_181a9d25769348a491c8e35f869b5b5f~mv2.webp)
![GXP16XX & GXP21XX XML Application User Guide](https://static.wixstatic.com/media/nsplsh_181a9d25769348a491c8e35f869b5b5f~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/nsplsh_181a9d25769348a491c8e35f869b5b5f~mv2.webp)
![](https://static.wixstatic.com/media/1318bd2fa0c44c4e9f1181621e92c3f4.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/1318bd2fa0c44c4e9f1181621e92c3f4.webp)
![UCM6510 ISDN J1 Configurations Example](https://static.wixstatic.com/media/1318bd2fa0c44c4e9f1181621e92c3f4.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/1318bd2fa0c44c4e9f1181621e92c3f4.webp)
![](https://static.wixstatic.com/media/39e94b_288a6ea3675b4eea9a209ff6f6d17144~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/39e94b_288a6ea3675b4eea9a209ff6f6d17144~mv2.webp)
![IPVT10 Hardware Specifications](https://static.wixstatic.com/media/39e94b_288a6ea3675b4eea9a209ff6f6d17144~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/39e94b_288a6ea3675b4eea9a209ff6f6d17144~mv2.webp)
IPVT10 Hardware Specifications
![](https://static.wixstatic.com/media/11062b_02f3dbceab3f4181a0ea4767efbf280d~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/11062b_02f3dbceab3f4181a0ea4767efbf280d~mv2.webp)
![How to Configure Syslog Server Locally in an Easy Way](https://static.wixstatic.com/media/11062b_02f3dbceab3f4181a0ea4767efbf280d~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/11062b_02f3dbceab3f4181a0ea4767efbf280d~mv2.webp)
How to Configure Syslog Server Locally in an Easy Way
![](https://static.wixstatic.com/media/496c3b27b21b42258436f5e1861ce01d.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/496c3b27b21b42258436f5e1861ce01d.webp)
![What is the GWN7000 supported OpenVPN version in Android?](https://static.wixstatic.com/media/496c3b27b21b42258436f5e1861ce01d.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/496c3b27b21b42258436f5e1861ce01d.webp)
What is the GWN7000 supported OpenVPN version in Android?
![](https://static.wixstatic.com/media/8635cf9eae8c453bbfa467752f7f0a7f.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/8635cf9eae8c453bbfa467752f7f0a7f.webp)
![What is the max. number of Panelists in IPVideoTalk?](https://static.wixstatic.com/media/8635cf9eae8c453bbfa467752f7f0a7f.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/8635cf9eae8c453bbfa467752f7f0a7f.webp)
What is the max. number of Panelists in IPVideoTalk?
![](https://static.wixstatic.com/media/e77fd1ddd12e4652b471fe86db43b889.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/e77fd1ddd12e4652b471fe86db43b889.webp)
![What ports are GWN.Cloud using?](https://static.wixstatic.com/media/e77fd1ddd12e4652b471fe86db43b889.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/e77fd1ddd12e4652b471fe86db43b889.webp)
What ports are GWN.Cloud using?
![How to get rid of the Dual Accounts Display?](https://static.wixstatic.com/media/39e94b_6b03956979ac4048acc87d506a269ff5~mv2.png/v1/fill/w_454,h_341,fp_0.50_0.50,q_95,enc_auto/39e94b_6b03956979ac4048acc87d506a269ff5~mv2.webp)
How to get rid of the Dual Accounts Display?
![](https://static.wixstatic.com/media/39e94b_c6698829d24f4e889a83cc342aba182a~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/39e94b_c6698829d24f4e889a83cc342aba182a~mv2.webp)
![How to Get Syslog and Ethernet Packets from Grandstream Devices (using Wireshark)](https://static.wixstatic.com/media/39e94b_c6698829d24f4e889a83cc342aba182a~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/39e94b_c6698829d24f4e889a83cc342aba182a~mv2.webp)
How to Get Syslog and Ethernet Packets from Grandstream Devices (using Wireshark)
![](https://static.wixstatic.com/media/nsplsh_99adc0c6cb334173972e2dffad14579b~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/nsplsh_99adc0c6cb334173972e2dffad14579b~mv2.webp)
![Grandstream UCM's Email Setting (Gmail)](https://static.wixstatic.com/media/nsplsh_99adc0c6cb334173972e2dffad14579b~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/nsplsh_99adc0c6cb334173972e2dffad14579b~mv2.webp)
Grandstream UCM's Email Setting (Gmail)
![](https://static.wixstatic.com/media/39e94b_c61dfa31030342b4812c10fb1a86988e~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/39e94b_c61dfa31030342b4812c10fb1a86988e~mv2.webp)
![How to Block Ghost Calls on the Phones](https://static.wixstatic.com/media/39e94b_c61dfa31030342b4812c10fb1a86988e~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/39e94b_c61dfa31030342b4812c10fb1a86988e~mv2.webp)
How to Block Ghost Calls on the Phones
![](https://static.wixstatic.com/media/nsplsh_3061527963736648353741~mv2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/nsplsh_3061527963736648353741~mv2.webp)
![How to Configure Redundancy Feature in Grandstream GXV33XX](https://static.wixstatic.com/media/nsplsh_3061527963736648353741~mv2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/nsplsh_3061527963736648353741~mv2.webp)
How to Configure Redundancy Feature in Grandstream GXV33XX
![](https://static.wixstatic.com/media/nsplsh_713855315967426152516b~mv2_d_5032_3355_s_4_2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/nsplsh_713855315967426152516b~mv2_d_5032_3355_s_4_2.webp)
![How to resolve 407 Proxy Authentication](https://static.wixstatic.com/media/nsplsh_713855315967426152516b~mv2_d_5032_3355_s_4_2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/nsplsh_713855315967426152516b~mv2_d_5032_3355_s_4_2.webp)
How to resolve 407 Proxy Authentication
![](https://static.wixstatic.com/media/11062b_012cc50146a54aa895ad0f02672ade6f~mv2_d_2500_1415_s_2.jpg/v1/fill/w_250,h_250,fp_0.50_0.50,q_30,blur_30,enc_auto/11062b_012cc50146a54aa895ad0f02672ade6f~mv2_d_2500_1415_s_2.webp)
![3CX Advanced Certifications Exams Sample Questions](https://static.wixstatic.com/media/11062b_012cc50146a54aa895ad0f02672ade6f~mv2_d_2500_1415_s_2.jpg/v1/fill/w_454,h_341,fp_0.50_0.50,q_90,enc_auto/11062b_012cc50146a54aa895ad0f02672ade6f~mv2_d_2500_1415_s_2.webp)
3CX Advanced Certifications Exams Sample Questions