Understanding SIP and RTP in Asterisk In a standard VoIP setup, SIP is used for signaling—establishing, managing, and terminating the call. Once the call is established, RTP (Real-Time Transport Protocol) carries the actual voice media. By default, Asterisk can either relay the media (RTP flows through Asterisk) or allow direct media, where RTP flows peer-to-peer … Read more
Description To ensure a smooth synchronization of your Google Contacts with the Grandstream GXV3480 video phone, follow these steps: Automatic Sync Setup (Android) Manual Upload Method Follow these steps to manually upload your contacts:
Description The GRP260X may fail to boot and get stuck at the Grandstream logo. The latest firmware version (1.0.7.11) resolves this issue. Recovery Methods How to check the phone’s IP address There are two methods to check the phone’s IP address:
This article addresses the video call establishment issue encountered with Grandstream Android IP Video Phones GXV3XXX when used with the Mitel MiVoice 3300 system. Users may receive a “Video Invitation Failed” error during calls. This issue can be resolved by adjusting the SIP Options and Signaling Header Manipulation settings under the Mitel system’s SIP Device … Read more
Call Park Feature Call Parking is a feature that allows a person to put a call on hold on one phone and continue or pick up from another phone. It can be activated by pressing the programmable key on an IP Phone. It will transfer the call to an unused ‘Parking Lot’ extension. The callers who … Read more
Description This article describes the instructions on how to upload 802.1x certificates in EAP-TLS mode with the Grandstream Android Video phone GXV3XXX series. Step 1: Navigate to Network Settings->Ethernet Settings->802.1X Mode > select EAP-TLS mode Step 2: Reboot the device after uploading certificates and it is filled with identity. Note: The users do not need … Read more
Description The Network Status indicating “NAT Type: UDP Blocked” means that the Grandstream IP Phone has detected that the SIP port is not properly port forwarded. Suggestions Note: STUN may not work with all routers, particularly those with Symmetric NAT enabled. References SIP ALG and why it should be disabled on most routers What is … Read more
Description This article explains the differences between Account Mode and Line Mode in the Grandstream High-end Color GXP21XX IP Phones, particularly regarding the Virtual Multi-Purpose Keys (VMPK) settings. When the phone is in Line Mode Dynamic Key Switching: If a line button is assigned only to Account 1, pressing the Account 2 key will dynamically … Read more
Description This article suggests the parameters to resolve the issue of call disconnect after a few minutes in Grandstream IP Phones. You can set these under Account > SIP Settings: 1. Force Timer to Yes 2. Force INVITE to Yes 3. Enable UAC Specify Refresher to UAC 4. Enable UAS Specify Refresher to UAS
The priorities of ringtones are played as follows, from high to low in the Grandstream IP Phone GRP260X series：1. Distinctive Ringtone (Type B)2. Contact Ringtone (under Contacts > Local or Remote Phonebook)3. Group Ringtone4. Distinctive Ring Tone (Type A)5. Account Ringtone6. System Ringtone